Thomas “Tom” Kosir
October 1, 2025
It is with profound sadness that we announce the passing of Thomas Kosir. Tom passed away at University Hospital on Wednesday, October 1, 2025, after experiencing unexpected complications following cancer surgery.
Tom was born and raised in London and was a graduate of Fanshawe College. He had a curious mind and liked to “tinker,” always taking things apart and putting them back together. He worked for Hydro One for over 35 years, getting to live in different cities and work with different teams. When not at work, he was the planner of our group, researching and booking the next family vacation, planning a euchre tournament, or arranging a pool party and BBQ. He retired in 2021 to take on his new role of Grandpa – his favourite job of them all. In retirement, he was busier than ever, staying active by biking around the city and always stepping up to help friends and family with whatever they needed.
Tom is survived by his beloved wife of 37 years, Karen; his children, Brittany (Matt) and Cory (Marlee); and his grandchildren, AJ and Lillian. He was predeceased by his father, Stan, and will be forever missed by his mother, Amalija, his brother Steve (Jacqueline), his nieces, nephews, extended family, and many friends.
A funeral service will be conducted at Westview Funeral Home and Cremation Centre, 709 Wonderland Road North, London, on Tuesday, October 7, 2025 at 12:00 p.m., with visitation two hours prior. Interment at St. Peter’s Cemetery to follow. A livestream will be available for those unable to attend the funeral service:
To access the livestream please click: Remembering Thomas
In lieu of flowers, please consider making a donation to the Verspeeten Family Cancer Centre through London Health Sciences Foundation, in recognition of the wonderful care he received, or the London Children’s Museum, where he demonstrated his love of children through volunteer work.
Tom enjoyed the simple things in life: spending quality time with family and friends, sitting in the sun by the pool, playing cards and games, and chipping away at his never-ending to-do list. He will be greatly missed by so many.
Leave a tribute for Thomas “Tom” Kosir
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Dear Karen and family: We are so very sorry to hear of Tom's passing. Please know that you are in our thoughts during this most difficult time.
To the Kosir family - On behalf of Tom and Brittany's friends at the London Children's Museum, we are incredibly saddened to hear this news. Tom was a wonderful person and we were so grateful that he chose to volunteer his time with us. We all enjoyed working with him immensely. Sending love and care your way. Our thoughts and hearts are with your family.
Our deepest sympathies go out to KK, Britt and Cory during this very sad time.
Our sincere condolences to Karen and the children. Our hearts go out to you all. May Tom R.I.P.
A donation has been made to Children's Museum. Message from the donator: In memory of a great man! We will all miss him!
Karen - you have been on my mind the past few days. I was shocked and saddened by the news of Tom's passing. I only knew you both through your visits with Amalja. You are both wonderful caregivers to her. Always a friendly hello to everyone. He will be missed. My deepest condolences to you and the entire Kosir family.
How sad to lose such a good person, worked closely with Tom for 20 years, we shared some great times at work, and after work. He will be missed. Condolences to Karen, Brittany, Cory and family in this difficult time.
I am greatly saddened to hear about Tom’s passing. My deepest sympathies to Karen and the entire Kosir family. May you find peace through your family and friends during this difficult time
We're so sad to hear this news Karen, Britt and Cory. Tom will be so missed, he was such a lovely, warm man. Big hugs to you all and our deepest condolences.
A donation has been made to the Verspeeten Family Cancer Centre.
So incredibly saddened to hear of Tom’s passing. We will forever remember and cherish all the wonderful times we spent together. Tom will be greatly missed and fondly remembered in our hearts. Karen, our deepest and heartfelt sympathies to you, Brittany, Matt, Cory, Marlee and your extended Kosir family. With love, Steve, Leona, Liam, Emily and Max Kobal
Tom was not only a great friend but also a remarkable mentor to me and to many others at Hydro One. I am deeply saddened by his passing and wish he had been able to enjoy the long and well-deserved retirement he worked so hard for. My deepest condolences go out to Tom’s family during this difficult time.
A donation has been made to London Children's Museum.
Karen & Family, Our thoughts and prayers are with you during this difficult time. Many fond memories of Tom at the club, his kindness and dedication and making sure everyone was having a good time. Love Dan & Caroline
My heartfelt condolences to the entire Kosir extended family. Tom was one of my absolute favorite colleagues here at Hydro One and was one of my mentors. Tom lives with fondness in the memories of so many that he trained and mentored over the decades he worked here. His positivity, patience, work ethic, calm approach, and outgoing personality made him the best teacher, and trusted friend. Thoughts and prayers with you during these difficult times.
I am so sorry to hear of the passing of Tom. He was a valued and well-respected co-worker and friend of mine for many years in the Hydro One London P&C team.
Our sincerest and deepest sympathy to the entire Kosir family. Karen, Amalija and Steve, may the memories of the past help you find peace and comfort to get you through these difficult days and beyond. The memories you share will keep Tom in your hearts forever.
A donation has been made to London Children's Museum. Message from the donator: We would like to express our great sadness for the passing of a beloved friend who was taken way too early... Remembering all the good times we've spent will be forever cherished in our hearts. Our most heartfelt condolences to your family - Karen, Brittany, Matt, Cory, Marley. Tom will be greatly missed! Forever in our Hearts xo Paul, Mojca, Thomas, Matthew, Amanda Daszko & Sonja Langenfus
We were so saddened to hear the devastating news. Tom was a great neighbour and friend for many years. He will be truly missed. Our heartfelt condolences to Karen and the entire family. Sadly we are out of the country so we will not be able to attend the memorial service, but our prayers are with you during this painful time of grieving.
Dear Karen, no words can heal the heartache you must feel right now. I’m so sorry for your loss. Cherish the wonderful memories you had with Tom. Take care of yourself and each other. Hugs Michelle Masse.
Dear Karen, Amalija, and Steve, Our deepest sympathies on your sudden loss. We will always cherish the memories we have of Tom and the times our families spent together. He always had a warm smile on his face and such a big heart. We know he will be missed greatly. Our thoughts are with you and your families at this difficult time. Sending hugs, Angela and Martha Krzic
Dear Mrs Kosir, Karen, Steve & families, We were shocked to hear of Tom's sudden passing. Wishing all of you peace to bring comfort and courage to face the days ahead and loving memories to forever hold in your heart. Please accept our deepest sympathy to all of you during this difficult time. Kathie & Stanley Tamse Marc & Tanya Taraborrelli
Dear Karen, Amalija, Steve, and the rest of the family. My deepest condolences on the sudden passing of Tom. I have such fond memories of Tom when we were kids and into our later teens—how well he played the accordion, and all the laughs and fun we shared in our Slovenian dance group. Tom was such a kind man with a smile that could light up a room. I will truly treasure those times. My thoughts and prayers are with you during this difficult time. God bless you and may you rest in peace, ‘Tommy’. With sympathy, Annie
We are so sorry to hear of Tom’s passing. He was such an amazing person. He will be so missed by all who knew and loved him.
Our thoughts and prayers are with you and your family at this very difficult time. Frank and Lucy Longo
Services for Thomas “Tom” Kosir
Visitation will be held at:
Westview Funeral Home & Cremation Centre
709 Wonderland Road North,
London, Ontario
October 7, 2025 10:00 am to 12:00 pm
Funeral Service will be held at:
Westview Funeral Home & Cremation Centre
709 Wonderland Road North,
London, Ontario
October 7, 2025 12:00 pm
Make a donation
If you wish to make a donation, please consider one of the charities listed below. You will be taken to the charity's website to process your payment.
Karen, Brittany, Cory and the entire family, there are no words that can lessen the grief from your tremendous loss. I pray that you find peace in the sweet memories you shared with Tom. His pride of all of you was always evident. I will keep his soul, and all of you, in my prayers. God bless you all.
~ Silvia Gamboso