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Did an hour pass before Jackson doctor called for ambulance?

A detective has testified that Michael Jackson's doctor said he noticed the singer stopped breathing earlier than prosecutors contend, raising a question of how closely the physician monitored Jackson after giving him the key drug that caused his death.

Prosecutors claim Dr Conrad Murray was negligent in his care for the singer and that, on the day he died Murray spent time covering up evidence of mistreatment instead of seeking help from paramedics after he discovered Jackson had stopped breathing.

Previously, prosecutors said that, judging by phone records, as much as 20 minutes may have passed, but yesterday a detective who questioned Murray two days after Jackson's death on June 25, 2009, offered times suggesting more than an hour elapsed.

Police detective Orlando Martinez testified that Murray admitted giving Jackson propofol -- the key drug responsible for his death -- between 10.40am and 10.50am.

Murray told Martinez that Jackson fell asleep around 11am and that after monitoring him for a time, the doctor went to the bathroom and came back to see he was no longer breathing.

"According to Dr Murray, is this sometime shortly after 11am in the morning?" Deputy District Attorney David Walgren asked Martinez.

"Yes," the detective said.

Phone company officials and another detective testified last week that Murray was on a series of calls for business and personal reasons from 11.07am until noon. Prosecutors say phone records show paramedics were not called until 12.21pm.

Murray has pleaded not guilty to the charge of involuntary manslaughter.