A homeless man declared brain dead after being severely beaten was taken off life-support Tuesday afternoon. His mother wants to donate his organs, but the Iowa Medical Examiner's office says an autopsy is essential to the prosecution of the crime.
Jeff Harriman was assaulted in a series of attacks between noon and 3 p.m. on Friday.
A witness told police he saw three men punching and kicking Harriman around his head and hitting him with a piece of wood.

Two transients have been arrested, Charles Armstrong and Mark Foster. The third suspect is being sought.
The Pottawattamie County attorney says he won't make any decisions about possibly changing those charges until Tuesday. The medical examiner says an autopsy is needed to prosecute Armstrong and Foster, but the procedure would make organ donation impossible.
"I told him, it's my son, it's my decision,” Ellie DeBall said Monday. “You have plenty of evidence, you do not need this."
Now she has a fight on her hands, fighting to donate his organs while he is kept on life support, fighting the same people who will prosecute her son's alleged attackers.
DeBall says she's clinging to every minute she has left with Jeff. "I keep going in there and hanging on to him and I prayed and prayed and I even prayed to God that if he let him live and he was a vegetable, I would take care of him. I couldn't even have explained it before now, how bad it hurts. My whole body hurts. My heart is just, it's awful.”
Jeff's friends built a cross on the 1800 block of Broadway after they found him Friday night. "It was a stupid thing to have happen and we thought we could make something positive come out of it,” said DeBall.
"It was heartbreaking, it ripped my heart right out of my chest,” said brother Kevin Harriman.
DeBall says the battle to save Jeff's organs is all but over. She's left now with her son's memories, the last one this past Fourth of July. "He hugged me and hung on to me. It was like he knew. He was like a little lost boy and that was the last time I seen him."
Organs from one person can save up to eight people. The Nebraska Organ Recovery System says they've had this happen before. Other states allow them to be in the room while the autopsy is performed and to harvest the organs while the autopsy is taking place. Iowa declined to do this.