O'Connell's widow, Alyssa, broke down in tears as the ceremony began with the playing of bagpipes and a monument was dedicated to her fallen husband at the Marysville Patrol District office where he was based.
Washington State Patrol Chief John Batiste comforted her and said the community would never forget the contributions of O'Connell, who served with the State Patrol for 16 years. He was the 28th trooper killed while on duty in Washington state.
"When we say we shall never forget, this monument is a reflection of the fact that we mean we shall never forget," Batiste said.
Also there was Snohomish County Executive John Lovick, who at one time was O'Connell's patrol sergeant.
"He was absolutely great at everything he did," Lovick said. "He always had a magic way of elevating you and just always making you feel good."
He said the new monument to O'Connell at the Marysville Patrol District office will stand as testament to the trooper, husband, father and friend he was.
O'Connell's widow Alyssa also unveiled a sign in Lake Stevens, dedicating 83rd Avenue SE to her late husband.
A Washington State Patrol detachment also travelled to Washington, D.C., earlier this month, when O'Connell's name was added to the memorial wall dedicated to peace officers.