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STEUBEN COUNTY, N.Y. -- It was another day of revealing testimony in Steuben County as a friend of murder suspect Marland Brooks took the stand against him.

Brooks is accused of stabbing Clark Van Etten to death in his Corning home last June.

Brooks' friend, Peter Frank, took the stand Monday. Frank drove Brooks and his girlfriend, Samantha Smith, to Clark Van Etten's home that night and waited in the car while the two spoke with the victim inside.

Frank said when they came out, Brooks said he punched Van Etten and stole his wallet. Frank told the court Brooks threatening to kill his family if he told police what happened.

The defense argues Frank's testimony is questionable because he is an admitted drug user.

"The whole idea about drug use is how does it affect their reliability and credibility of witnesses? Their voracity as a witness? Their trustworthiness as a witness? Or simply their ability to recall?" said Brooks' attorney David Morabito.

"When you look at his testimony and the physical evidence that will come in, he was actually very consistent with what Samantha said about what happened with the truck and times and very consistent with the physical evidence that will be produced throughout the trial," said Steuben County District Attorney Brooks Baker.

Two State Police investigators also took the stand. They testified that fingerprints inside Van Etten's home were unidentifiable and blood was found in Frank's truck.

Brooks' attorney says the killing was an act of self-defense.

Testimony continues Tuesday.