CHARLESTON, W.Va. (AP) — A West Virginia man who threatened U.S. Sen. Joe Manchin's life has been sentenced to 18 months in prison.

Steven Anthony Major received the sentence Wednesday from U.S. District Judge Thomas Johnston in Charleston.

In February, the 50-year-old Major pleaded guilty to threatening to kill Manchin. He admitted to calling Manchin's Charleston and Washington, D.C., offices on four occasions in March 2014.

On each occasion, Major left a voicemail making violent threats against the senator and his family members. He identified himself in the messages.

Major also was sentenced to three years of supervised release.

The Federal Bureau of Investigation, U.S. Capitol Police and West Virginia State Police conducted the investigation.