PORTLAND, Ore. (KOIN) ? A man in Portland arrested last year for a homicide dating back to 1999 has been charged with a second murder after detectives said they found the remains of another victim at his home.

Multnomah County District Attorney Mike Schmidt said Wednesday a grand jury indicted 53-year-old Christopher Lovrien with the homicides of Mark Dribin and Kenneth Griffin.

Dribin was 42 years old when he disappeared in July of 1999. A search of Dribin?s home and vehicle following his disappearance revealed an unknown suspect?s DNA, according to investigators.

The initial investigation failed to match the DNA evidence to a suspect. It remained in the national DNA database.

In March of 2019, the case was reopened by the Portland Police Bureau?s Cold Case Unit and the DNA was submitted for Forensic Genetic Genealogy analysis. New findings allowed investigators to move forward and on April 30, 2020, a grand jury returned an indictment in the case, leading to Lovrien?s arrest for Dribin?s murder a few days later. The location of Dribin?s body remains unknown, officials said.

On May 19, detectives searched Lovrien?s shed at his home near SE Foster and 120th and discovered Griffin?s dismembered remains, according to court documents. Griffin was last seen on Feb. 1, 2020, and reported as missing the following day.

Multnomah County Chief Deputy District Attorney Kirsten Snowden said Griffin was not homeless at the time he disappeared but ?he didn?t have long-term stable housing.?

The re-indictment on Wednesday charges Lovrien with two counts of second-degree murder, abuse of a corpse and six counts of being a felon in possession of a firearm.

Investigators said they don?t believe Lovrien knew either of his victims. They think he may have killed more people based on evidence reportedly found at his home.

?We have evidence there they may be additional victims ? how many and from when and where are some things we can?t get into. But yeah, more than the two we know about,? said PPB Cold Case Homicide Detective Brendan McGuire.

Anyone with information about missing persons who may have been living under the I-205 bridge in Southeast Portland between the summer of 2019 and May 2020 and had contact with Lovrien is asked to contact Portland Police Detective Brendan McGuire at or 503.823.0869 or PPB Detective Scott Broughton at or 503.823.3774.

Lovrien was arraigned Thursday in Multnomah County Circuit Court.