May God bless you and your...
Such an amazing person, GIF bless him and family. Classmate tribute.
Marlene
February 01, 2026 | School


Sun Lakes, Arizona
1939 - 2025
Dr. Mark Joseph O'Neill passed away Nov. 4th 2025, in Sun Lakes, Ariz., with his loving wife of 63 years by his side. Born in Butte, Mont. on Oct. 9th, 1939 to Dan and Mary O'Neill. He graduated from Boys Central High School in 1957. He joined the U.S. Marine force in June of 1957 and was off to...
Read MoreSuch an amazing person, GIF bless him and family. Classmate tribute.
Marlene
February 01, 2026 | School
To Msgr. Kevin and Mary Ann, we send our sincere sympathy on the loss of your brother. We did not know Mark, but your family is in our thoughts and prayers. It is never easy to lose those we love.
Janet & Dan Wheeler
January 31, 2026 | Friend
My Uncle Mark was larger than life! He'll forever remain at the top of my Top Ten List of greatest people I've ever met. He was a helper and extended a positive attitude to each and everyday. He left me with many wonderful memories! I'll forever be grateful for the many lessons he taught me along the way. I'll carry your memory with me in my heart.
Shelley McGregor
January 31, 2026 | Family
Fr Keven and Mary Ann and all; please accept my sincere condolences for your loss of Mark.
Joe Dziak
January 30, 2026
We were friends and we went into the Marines at the same time .Mark was a great person.Diane sorry for your loss
Eddie Medina
January 23, 2026 | Friend
Jodi Miller AL and I where so sorry about hearing the loss of Dr.O we have so many great memories of time spent with you and the family in my early years I can still hear him say how's your onion and then him laughing never finding out what that meant to spending the 2 summers here in Penticton you will be missed hugs and love to the whole family rip Mark love you
Jodi
January 22, 2026 | Friend
Mark was a great person to be with always smiling, and a great story teller, especially about dental school Had fun times together. loved potica!!!
Tom and Betty Repenshek
January 22, 2026 | Friend
Sending much love and condolences to the family. There are so many memories and special times from the head of the lake, to skiing, to times spent in Spokane, and a whole bunch in between. Always in our hearts and never forgotten. Love Sherri and Rob Frederick and the whole crew
Sherri Miller
January 22, 2026
Diane, sorry to read of Mark´s passing. Reading of the adventures life you two had, will leave you with wonderful memories. Wishing you happiness as you move on to a new life. Pat (Schmidt) Jumes
Pat Jumes
January 22, 2026 | Other