DENVER (AP) — The Latest on a man who pleaded guilty to trying to bomb a Colorado police department (all times local):

11:15 a.m.

A man harboring a decades-old grudge against authorities pleaded guilty Tuesday to planting a backpack bomb outside the police station in a Colorado mountain town.

David Michael Ansberry acknowledged his motive stemmed from the 1971 killing of his friend and fellow hippie by the town marshal.

Ansberry, 65, said he changed his plea because of a preexisting health condition, which he did not specify.

According to court documents, Ansberry attempted to set off a bomb last October in front of the police department in Nederland, about 15 miles southwest of Boulder. Nobody was injured because the device failed to detonate.

Ansberry was arrested a few days later in Chicago on a layover between Denver and Baltimore.

He is to be sentenced Nov. 30 and faces 30 years to life in prison.

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2:30 a.m.

A man accused of leaving a bomb outside a police station in a small Colorado mountain town to avenge the killing of a fellow member of a hippie group in the 1970s is expected to plead guilty.

David Michael Ansberry is expected to acknowledge Tuesday that he left a powerful bomb containing arsenic outside the Nederland Police Department on Oct. 11.

Surveillance video captured him buying cellphones to trigger the explosive. He was easily recognizable because he is 3-foot-6, 100 pounds and uses crutches.

The device did not detonate.

Investigators say he was trying to avenge the 1971 killing of his friend Guy Goughnor at the hands of Renner Forbes, who was a town marshal at the time. Forbes was convicted of the killing in 1998.