Scientific tests could provide investigators more clues about the deaths of two men whose partially decomposed bodies were found in a Butler house Monday.

“We’re hoping to get more information from toxicology tests that may help us determine what happened here,” Butler police Detective Sgt. David Dalcamo said Thursday.

But test results could be weeks away.

Police suspect Kenneth Donald Vogel, 56, and John F. Frazier, 55, both died of drug overdoses in Frazier’s modest, two-story house on Wyle Avenue, where he lived alone.

“We believe these were accidental deaths,” Dalcamo said, “but we still have a lot of unanswered questions.”

A neighbor’s tip Monday afternoon led police to the grisly discovery. A pathologist’s best guess is the men had died three or four days earlier.

The alert neighbor recognized a pickup truck parked at the home as one described in a police issued missing-person advisory.

City police were seeking the public’s help in tracking down Vogel’s whereabouts. His wife had no contact with him since 11 p.m. Aug. 21, when he ended his shift as a driver for Cranberry Taxi.

Along with personal information about Vogel, the police advisory described the vehicle he drove — a 2001 Chevy pickup.

Police about 5:20 p.m. forced their way into the house after an officer looked in a window and saw a body.

Vogel’s body was in the kitchen and Frazier’s body was close by in the bathroom.

“There was no sign of foul play,” said police Capt. Ron Fierst.

On the kitchen table, according to a search warrant inventory, police found one empty stamp bag of suspected heroin, two hypodermic needles, two spoons and a lighter.

Autopsies done Monday night were unable to determine how the men died. But investigators had immediate suspicions.

“We suspect they died of drug overdoses,” Fierst said, “because of the paraphernalia that was found.”

But that paraphernalia — or lack thereof — also raised questions.

Investigators don’t know if someone else or others could have been with the men, and possibly “cleaned up” the house before leaving.

Another question: Did the men consume drugs somewhere else before ending up at Frazier’s home?

What about a potentially “bad batch” of heroin that was more pure than most street heroin or was it mixed with lethal chemicals?

Police declined to speculate. However, they warned the use of any illicit drugs is extremely dangerous with potentially tragic consequences.

Investigators are speaking to family and friends of Vogel and Frazier in hopes of answering some of their questions.

The men’s comings and goings before their deaths have not been nailed down.

Police know Vogel was alive early on Aug. 22 and Frazier was alive on Aug. 25. But their whereabouts after that — until their bodies turned up — is unknown.

Toxicology tests may provide police with the best hope for answers. The tests could confirm that the deaths were caused by drug overdoses.

Possibly, the tests may quantify the potency and composition of the drug or drugs that killed them.

Police admitted neither Frazier nor Vogel was a novice drug user, meaning they likely knew what they were doing.

Test results could take up to two months.