I was there and I will tell you what I saw.
I was at the bottom of the stairs getting ready to go in and a small group of divers called out to call 911. They were about 20 yrds from the stairs and began to tow him in. I saw someone performing rescue breathing while towing him to the stairs.
At this point, I went to the top of the stair to get out of everyone's way. Luckily, there was a harbor patrol officer at the point and heard everyone yelling for 911. He called in for help on his radio. Meanwhile, a group of divers (don't know if they were with him or not), carried him up the stairs and began to perform CPR. Paramedics arrived, took over, and cut off the wet suit. He was blue. They continued to perform CPR and said he had no pulse.
They decided to defibrillate but because he was in a puddle of water, they lifted him to a gerney (sp?). I never saw them defibrillate him but he did get his pulse and started to breath on his own. They started calling his name and he seemed to respond. They wheeled him over to a LA County paramedic boat in the harbor and loaded him up and took off.
The rest of the day, there were Fire Dept. and Sherrif officers coming around and asking questions. We asked one of the paramedic's who came back and he said the guy didn't make it.
From what I heard, the diver was conscious when he surfaced but was "out of it". He was a large guy and rumored to have had 45 pounds of lead on him. The buzz for the rest of the day was he had a heart attack unrelated to diving, but I don't think anyone knows for sure what happened.