( CNN ) -- Los Angeles police have posted the images of 42 women culled from the photo collection of the `` Grim Sleeper '' serial murder suspect on social media and the department website , officials announced Thursday . The photographs were taken between 1976 and 2010 , and the women in them have yet to be identified , police said in a news release . If anyone recognizes one of the women , they can use Twitter ( https : //twitter.com/LAPDGrimSleeper ) or Facebook ( https : //www.facebook.com/pages/LAPD-Grim-Sleeper/269881769790597 ? fref=ts ) to make a positive identification . The number to make an anonymous tip is 800-222-8477 . Lonnie David Franklin Jr. , who was arrested in July 2010 , is accused of killing women ranging from ages 14 to 36 between August 1985 and January 2007 . Many of the victims were prostitutes , authorities have said in the past . Most of the sleeper 's victims were discovered dumped in south Los Angeles alleys and covered with debris , authorities said . All victims were shot ; some were strangled too , an indictment alleges . Authorities widened their inquiry to include all homicides that occurred in a general area of south Los Angeles where Franklin lived from the 1970s , when he got out of the military , through the 1980s , police spokeswoman Karen Rayner said in August 2011 . That amounts to about 230 murders , and even some that officials thought had been solved , she said . Franklin , 59 , has pleaded not guilty to 10 charges of murder and one of attempted murder . Prosecutors said they will seek the death penalty against Franklin . Before his arrest , Franklin had worked for a time as a garage attendant at a Los Angeles police station , authorities said . The killer was nicknamed the Grim Sleeper because he seemed to take long breaks between homicides , police said . Grim Sleeper survivor : 'You 're at his will '
Police post photos taken from collection of serial killer suspect . Public can view them on Facebook or Twitter . Lonnie David Franklin Jr. is charged with 10 murders . Police have widened scope of investigation to 11 killings .