The deputies carried Wirth from the courtroom as he continued to struggle. Authorities say a stun gun was used on the 25-year-old defendant.
WTMJ-TV reports that moments before the outburst, a judge set bail at $1 million.
Wirth is accused of fatally shooting off-duty Town of Oconomowoc police officer Jennifer Luick and Gregg Peters after a dispute at a Jefferson bar early Sunday.
Wirth's attorney, public defender Jeffrey De La Rosa, did not immediately return a call seeking comment Tuesday.
