PORTLAND — The man charged with attempted murder in the shooting of a Gray man is being held on $500,000 bail following his initial appearance in Portland court today.

Jon Brown, 52, is the first person in at least 25 years to be prosecuted here for a second attempted murder.

Brown was sentenced to 20 years in prison for attempted murder in 1983 in Portland. Now he stands accused of the same crime again, though authorities do not believe the victim in the last incident has any connection to the earlier one.

Police are still trying to determine a motive.

Assistant Cumberland County District Attorney Bud Ellis said it is the first time he has prosecuted someone for attempted murder after they were already convicted of the crime previously. The prior conviction means he was charged with aggraavated attempted murder this time.

Brown is accused of tying up and shooting Harold Small in the head on Sunday. Small was able to free himself and go to a neighbor’s for help.

Brown was arrested by the Maine State Police tactical team in a rental cabin in Windham on Monday night.

Brown is being held at Cumberland County Jail.