Abner Krill was just one of many gimmick-based Batman villains of the Silver Age of Comics. ... When the Human Flame betrayed the rest of the group and used his fire powers on the Gotham streets, a manhole cover shot up from the ground and fell on Polka-Dot Man's head, killing him instantly.

Is Polka-Dot Man really dead?

Due to the dangerous nature of the mission, not all members of the team made it to the end of The Suicide Squad, with Flag and Polka Dot Man dying in battle but for different reasons: Flag was stabbed by Peacemaker, who was following Waller's orders closely and got into a fight with Flag, and Polka Dot Man was crushed ...

What happened to Polka-Dot Man?

The group was undone when they were betrayed by the Human Flame. Most were killed in the brutal battle, including Mister Polka-Dot. His head was crushed after a manhole cover landed on it.