Dark Horse Comics chose a fitting venue to announce its graphic novel about the 20-year search for the Green River killer: Emerald City ComiCon, held this weekend in Seattle.

Gary Ridgway, considered one of the most prolific serial killers in American history, was convicted in 2003 of murdering 48 women in the early 1980s and dumping most of their bodies in or along the Green River in Washington. He is suspected of killing dozens more.

Green River Killer: A Detective Story, planned for release in early 2010, is penned by Jeff Jensen, an Entertainment Weekly writer and son of Green River Task Force Detective Tom Jensen. The 120-page graphic novel is illustrated by Ramon K. Perez.

The seventh annual Emerald City ComiCon kicks off at 10 a.m. Saturday at the Washington State Convention & Trade Center.