Musician Martyn LeNoble has been subjected to menacing tweets from an anonymous account, prompting officials at the Los Angeles Police Department (Lapd) to launch an investigation, reported TMZ online.
Cops served a search warrant on Twitter Headquarters in San Francisco, six days after the horrifying messages emerged.
The profile has since been deleted.
The hate-filled tweets read, "You stole (Christina) away from me. If not for you she would be mine... I will not accept this. I am going to kill you... I'm going to bust your head in for taking her away from me!!!
"...Be afraid, be very afraid!! You think this is a joke? I want to see how funny you think I am when I blow your head off."
