Police said they found a mescaline lab at the Hillsboro home of the man deputies shot and killed after a Nov. 21 shooting rampage in Hillsboro and Cornelius.

HILLSBORO, Ore. - We're learning more about a Hillsboro man police said went on a deadly shooting rampage Saturday.

Investigators still don't know exactly what sent Shawn Schumacher over the edge. However, they have said that Schumacher was physically overheating - wearing only khaki shorts with his car's windows rolled down - when he suddenly snapped Saturday morning.

Once he snapped, he started ramming other cars before opening fire at the Hillsboro intersection of Southeast 10th Avenue and Oak Street.

Caught in Schumacher's spray of bullets was 56-year-old Danny LeGore. (See photo of Le Gore on his bike.) He died after being airlifted to OHSU's hospital in Portland.

Just after Saturday's shooting, deputies said Schumacher led them on a four-mile chase to Cornelius where he opened fire again - before deputies shot and killed him.

Saturday night at Schumacher's Hillsboro home a narcotics team found a small mescaline lab. However, since Schumacher had no criminal record, deputies said it remains unclear what would driven him to go on such a violent rampage.

"This is such bizarre behavior especially for someone with no criminal history," said Sergeant Bob Ray with the Washington County Sheriff's Office. "We may never really know what drove him to this."

Mescaline is a hallucinogen commonly found in the cactus; it's a derivative of peyote. Deputies said that mescaline labs in Washington County are extremely rare.