Law enforcement indicates that Chicago Mercy Hospital gunman Juan Lopez purchased a number of guns legally during the past five years.

According to CBS News, Chicago Police Department spokesman Anthony Guglielmi indicated Lopez had purchased four firearms during the five-year time span. He used a handgun to carry out the attack that killed three people on Monday, first shooting his ex-fiancee, Dr. Tamara O’Neal, then going into the hospital and shooting Danya Less.

Lopez also shot and fatally wounded Chicago PD Officer Samuel Jimenez while exchanging gunfire with police.

The Journal Star reports that Chicago PD’s Guglielmi also indicated that Lopez had a concealed carry license. This means he went through numerous background checks, as he would have been required to get a Firearm Owners Identification (FOID) card  before getting the concealed carry license.

Lopez is but the latest in a long line of public attackers who cooperated with every gun control necessary to legally purchase firearms.

The list:

Despite the incontrovertible evidence that background checks do not stop determined attackers–even when there are numerous checks involved via FOID card requirement and concealed carry license–Democrats inevitably push background checks after nearly every high profile public attack.