‘They’re compassionate and determined’: Investigators use new technology to keep pursuing Clark County’s cold casesSubscriber Exclusive

Volunteer investigator Michael Ramon walks through the hallway at the Clark County Sheriff’s Office Cold Case Unit offices in downtown Vancouver on May 14. Ramon is retired from the U.S. Marshals Service.

Volunteer Clark County cold-case investigator Michael Ramon is working on the unsolved 1982 homicide of Catherine Dawes. (Amanda Cowan/The Columbian)

Investigator Michael Ramon looks over files at the Clark County Sheriff’s Office Cold Case Unit office in downtown Vancouver on May 14. (Amanda Cowan/The Columbian)

The Clark County Sheriff’s Office Cold Case Unit offices are pictured in downtown Vancouver on May 14. (Amanda Cowan/The Columbian)

Clark County Sheriff’s Office Cold Case Unit investigators start their work by poring over files. (Amanda Cowan/The Columbian)

Columbian archives Catherine Grace Dawes Slain on Jan. 18, 1982, at the Minit Mart Quick Shop at 10409 S.E. Mill Plain Blvd.

Catherine Grace Dawes, 27, was murdered on Jan. 18, 1982 shortly after 1 a.m. at the Minit Mart Quick Shop at 10409 S.E. Mill Plain Road. She was working the graveyard shift to earn money for Christmas gifts and was expected to leave her position days after her murder. (The Columbian Archives)

Clark County Sheriff’s Office Sgt. Matt Volker and Cold Case Unit volunteer Doug Maas conduct a briefing April 3 before a search of the Yacolt Burn area for the remains of Jamie Grissim, who was 16 when she went missing in 1971. (Tyler Brown/The Columbian)