Shaha Mishaal Adham, a suspect in the attempted murder of hairdresser Scott Ruffalo – who is the brother of actor Mark Ruffalo – is in police custody, PEOPLE has ?confirmed.

Adham, 26, turned herself in to Beverly Hills police on Monday. Police issued an attempted murder warrant for her arrest earlier on Monday. Adham is being held without bail.

?Adham's friend Brian Burton Scofield, 29, who is "a person of interest" in? the case, also arrived at the police station with Adham. He was booked for a misdemeanor traffic warrant for past? violations.

Scott Ruffalo, 39, was shot in the head on Dec. 1 at the condo where he lives on North Palm Drive in Beverly Hills.

A well-known hairdresser who worked in salons such as Kenneth George in ?Santa Monica and Giuseppe Franco in Beverly Hills, Ruffalo has had run-ins? with the law in the past. In 2002, he was convicted for possession of a? controled substance with intent to sell.?

He is currently at a Los Angeles hospital where he is reportedly in critical ?condition.