Police said the threatening messages were left on a voicemail at Boxer's office.
Kevin Joseph O'Connell of San Rafael was arrested on Saturday and is being held on $500,000 bail.
The 47-year-old is scheduled to be arraigned on Tuesday.
Police said the threatening messages were left on a voicemail at Boxer's office.
Kevin Joseph O'Connell of San Rafael was arrested on Saturday and is being held on $500,000 bail.
The 47-year-old is scheduled to be arraigned on Tuesday.