The assistant called 911 and described the 'Self Care' singer as already being "blue".
Examiners found a 1/4 inch abrasion on the bridge of his nose, and he had blood coming out of a nostril.
Close to Mac's body was an empty alcohol bottle on a nightstand, and he had a rolled $20 bill with white powder residue in his right pocket. A bottle of prescription pills was found in the bathroom.
An autopsy was completed on the star's body three days after he died before it was released to his family.
It was previously revealed that Mac had likely been "dead for hours" before his body was discovered.
Police and paramedics had arrived to his San Fernando Valley home around midday but they were said to have quickly realised he had passed away long before they were called to the scene.
The night before Mac was discovered, he had had friends over to the house to hang out, and they left in the early hours of the Friday morning, with police revealing no one has come forward to say they had seen him alive after that night.
It was previously claimed Mac's California home had been "swept clean" so there would be no evidence of drug use.
Where to get help:
• Lifeline: 0800 543 354 (available 24/7)
• Suicide Crisis Helpline: 0508 828 865 (0508 TAUTOKO) (available 24/7)
• Youthline: 0800 376 633
• Kidsline: 0800 543 754 (available 24/7)
• Whatsup: 0800 942 8787 (1pm to 11pm)
• Depression helpline: 0800 111 757 (available 24/7)
If it is an emergency and you feel like you or someone else is at risk, call 111.
