"onto (his) face and mouth" when he pleaded for water.
When the police responding to a domestic disturbance call, as witness by the man's children who they say was not armed and had committed no crime, the police pepper-sprayed their father and then Tasered him a “countless number of times.” The children also observed that while their father was hogtied, handcuffed, and faced down in their backyard, one of the cops kept his knee on their father's back.
http://www.courthousenews.com/2012/04/10/45478.htm
Then, according to the information from the federal complaint:
“Decedent stated that he couldn’t breathe and that he needed water; an officer ran water from a hose onto decedent’s face and mouth to the point of making it more difficult for decedent to breathe. Decedent tried to move his mouth away from the water and gasp for air. A witness yelled ‘He can’t breathe, you’re drowning him,’ but the officer continued running water over decedent’s face.
“After turning the water off, the Doe Officer(s) continued to press his knee against decedent’s back and continued to put pressure on it. Witnesses repeatedly asked officers to let decedent get up because he couldn’t breathe, but their cries for help were ignored. “By now there were in excess of 15 deputies and officers on the scene.
...
“Officers, after much pleading from witnesses, checked decedent’s pulse and discovered he had stopped breathing after not feeling anything when they touched decedent’s neck. “Decedent had his handcuffs taken off and was untied and placed on his back on the ground. After some time had passed, an officer started doing chest compressions but none of the officers administered mouth-to-mouth resuscitation to the decedent. Ultimately a witness at the scene administered CPR to decedent. “Some time later, an ambulance arrived and took over trying to revive decedent.”
http://theduckshoot.com/blog/californian-cops-pepper-sprayed-tasered-drowned-innocent-father/