His girlfriend vanished in 1993, now he's charged with his wife's murder

(WJBK) - A Ypsilanti man has been charged with the murder of his wife after she was found dead in February, but we've learned that this isn't the first time he's been suspected in a crime.

Gregory Agnew was arrested at his home on Dorset in Ypsilanti on Thursday. He was charged with murdering Martha Agnew, his wife, back in February. The sheriff's office originally labeled her death suspicious and have since tied him to her murder and also the disappearance of his girlfriend 25 years ago.

Martha was found dead back in February by her daughter.

"We got a phone call from the daughter saying what happened, it was a shock," said Tina Wagner, a friend of Martha. "It has been a little while and we have not heard anything else about it. And then the detectives asked us questions but we didn't know a lot about it."

Detectives probed the case which was first labeled as suspicious. At the time, there was no 'clearly visible evidence' to pinpoint what happened to Martha.

Once the medical examiner finished its inquiry, however, prosecutors said there was 'significant evidence linking Gregory Agnew to her death.

Gregory is also suspected of being involved with the disappearance of his girlfriend, Tammy Niver, in 1993. The then-23-year-old vanished after officials said she broke up with Gregory. 

Her car was found running in the middle of the street that night but she's never been seen.

"It is an open investigation we are still working to find out what exactly happened, where she is," said Derrick Jackson, Washtenaw County Sheriff's Office.

FOX 2: "And he is still a person of interest?"

"He's still a person of interest," Jackson said.

He has not been charged with anything in relation to Niver's disappearance but he's being held on a $500,000 bond for his wife's death. A court date has not been set.