NEW YORK — After a mentally ill Bradley Ballard made a lewd gesture to a female guard at the Rikers Island jail, he was locked in his cell alone for seven increasingly agitated days in which he was denied some of his medication, clogged his toilet so that it overflowed, stripped off his clothes and tied a rubber band tightly around his genitals.

During that period, guards passed Ballard’s cell in the mental observation unit dozens of times, peering through the window in the steel door but never venturing inside — until it was too late.

The 39-year-old Ballard was eventually found naked and unresponsive on the floor, covered in feces, his genitals swollen and badly infected. He was rushed to a hospital but died hours later.

“He didn’t have to leave this world like that. They could have put him in a mental hospital, got him some treatment,” Ballard’s mother, Beverly Ann Griffin, said from her Houston, Texas, home. “He was a caring young man.”

Ballard’s death last September, detailed in documents obtained by The Associated Press and in interviews with two city officials on condition of anonymity, came five months before another Rikers inmate in a similar mental health unit died in a cell that climbed to a suffocating 101 degrees because of malfunctioning heating equipment.