BANGOR — Several employees of the Maine State Crime Lab took the stand today as the first week wrapped up in the double-murder trial of a 56-year-old Biddeford man accused of shooting two brothers to death last year.

Forensic chemist Michelle Fleury said she examined clothing belonging to accused murderer Rory Holland, but found no holes, tears or blood stains on the items.

The 56-year-old Holland claims he shot 19-year-old Gage Greene and his 21-year-old brother, Derek Greene, in self-defense.

Eyewitnesses have testified that they saw Gage Greene approach Holland, who was standing outside his home on South Street during the early morning hours of June 30, 2009.

Those same witnesses said the men had an altercation, Greene pushed Holland and Holland shot him in the chest. He died nearly immediately at the scene.

When Greene’s brother, Derek, ran across the street toward them, Holland opened fire on him. Derek Greene was struck in the chest, the pelvis and the elbow. He was dead upon arrival at Maine Medical Center, according to testimony.

Fleury, the chemist, testified today that there appeared to be fibers on Gage Greene’s fingernails, but she did not test them to see if the fibers had come from Holland or his clothing.

Evidence also was admitted today that Holland’s DNA was found on the handle of the gun that police say was used to kill the Greene brothers, and on a separate loaded magazine that was found at Holland’s home.

Testimony is expected to continue for much of next week.

Justice Ronald Cole is presiding over the trial, which was moved to Penobscot Judicial Center in Bangor because Holland’s attorney felt his client could not get an unbiased jury in southern Maine.

Holland twice ran for mayor of Biddeford, has sued the city, including the police department, several times, and in the 1970s was convicted of attempting to murder his 16-month-old daughter.