Los Angeles County prosecutors began laying out their case today against Michael Jackson's personal physician.
They've charged Dr. Conrad Murray with involuntary manslaughter for giving the pop singer a fatal dose of a powerful sedative 18 months ago.
Prosecutors are trying to convince a judge to let a trial move ahead.
Deputy District Attorney David Walgren told the judge that Jackson was already dead when paramedics arrived at his Holmby Hills residence.
But he said Murray didn't tell them he'd given Jackson the sedative propofol - and didn't tell doctors at the emergency room, either.
Walgren said Murray did tell a security employee at the house to collect medical evidence in Jackson's room.
The prosecutor said Murray called 911 after that.
Tests later showed that Jackson died from a propofol overdose.
Music producer Kenny Ortega - who was prepping Jackson for his planned concert appearances in London - testified that he'd worried about the 50-year-old entertainer's health during rehearsals.
He said Murray told him that wasn't Ortega's "responsibility" - and he described Murray's manner as "scolding."
Ortega said Jackson later assured him he was "fine." Prosecutors could call more than 30 witnesses as they build their case that Murray should go on trial for involuntary manslaughter.