Sounds like this pax coned, so all the CPR in the world wouldn't have made any difference.
I hate to say this, but without suction, a laryngoscope and a cuffed tube CPR of someone who's really not breathing isn't that successful. Like as not the airway is full of vomitus or gastric contents that's hard to clear and keeps coming back. The stomach inflates and it's almost impossible to ventilate someone successfully for long, if at all.
External cardiac massage may keep a bit of circulation going, but it isn't enough. If you can't get at least some spontaneous cardiac output pretty quickly then it's sayonara.
For effective on-the-street CPR you need good ventilation, circulatory access (a drip), the right drugs, a defib, some idea of what you're doing and a lot of luck.
T-shirt, etc.