MARTINEZ,   (AP) — A Richmond gang member has been sentenced to 31 years in prison for joining the gang rape of a lesbian in 2008.

Robert Ortiz, 20,  was sentenced after he pleaded guilty Friday to rape in concert, forcible oral copulation in concert and carjacking.

Authorities say Ortiz was 15 in December 2008 when he and two other gang members repeatedly sexually assaulted the victim, who was walking home in Richmond.