BINGHAMTON - A second witness connected to a high-profile murder case was slain over the weekend, but a federal prosecutor says there is no link between the two homicides and the case.

Kallin Richards, 24, testified in August against Corbin Douglas Sr., who was eventually convicted in U.S. District Court of fatally overdosing his 14-month-old son with morphine in a baby bottle.

Douglas was sentenced in January to 30 years in federal prison. Richards was shot and killed Saturday while sitting in a vehicle in Sherburne.

Police have charged 23-year-old Joshua Story with the second-degree murder in the slaying.

They said the two men had fought earlier in the day.

In July, Joshua Richheimer, 32, was shot to death during an armed robbery two weeks before he was scheduled to testify against Douglas.

Police said Richheimer, armed with a shotgun, broke into a house in Sherburne and was shot to death by the owner, who he was trying to rob of drugs and money.

Homeowner Robert Reynolds and a neighbor were later accused of burying Richheimer's body in a shallow grave on Reynolds' property.

Reynolds pleaded guilty in September to second-degree unlawful possession of marijuana, a felony.

He was not charged with Richheimer's killing after police said he acted in self-defense.

Assistant U.S. Attorney Miroslav Lovric said neither death was connected to the Douglas trial.

However, both Richheimer and Richards used illegal drugs with Douglas at his Morrisville home, witnesses testified during Douglas' trial in August.