CORUNNA, Mich. (AP) — A jury convicted a trucker of first-degree murder Thursday in the shootings of an abortion protester and a businessman in a small Michigan community, rejecting claims that the gunman could not be held criminally responsible because he was mentally ill at the time.

The verdict came after less than six hours of deliberations in Shiawassee County court, 90 miles northwest of Detroit. Harlan Drake, 34, faces life in prison without parole.

‘‘We had a fair opportunity to present our defense,’’ Drake’s lawyer, Robert Ashley, told The Associated Press. ‘‘The jury made its decision. I’ve got no quarrel.’’

This wasn’t a whodunit: Ashley conceded in his opening statement that his client killed James Pouillon, 63, and Mike Fuoss, 61. Drake testified for hours this week, telling jurors that he was dangerous and deserved to die for his action.