Some neighbors wonder if that marijuana made the 38-year-old a target for murder.
Aurora police spent much of Sunday and Monday gathering evidence at the condominium on the 10300 block of East Jewell Avenue.
Crime tape was still up and the lights in the condo were left on Monday evening.
Neighbor Ardie Reil described her complex as quiet and peaceful.
"We've lived here for a long time and felt very safe," Reil said.
That feeling of safety was shattered over the weekend, when someone shot and killed Muse.
Aurora police say an acquaintance, described by neighbors as Muse's landlord, found him dead just after 11 p.m. Saturday.
In radio reference recordings, a dispatcher is heard describing the man's call to police.
"He came to collect the rent. He sees his renter on the floor. It looks very suspicious. There is a lot of blood everywhere," the dispatcher said.
Jan Petersen and Reil had no clue Muse, who lives just a few doors down, was a medical marijuana caregiver.
"Well we were shocked," Petersen said.
Marijuana dispensaries are illegal in Aurora, but the Colorado constitution says you can get a license to grow marijuana for yourself and others as long as you're not selling that pot for a profit.
Petersen wonders if Muse was targeted for the marijuana in his house.
"If someone knows that someone is in that business and wants to take advantage of it [and gets] the wrong door - you could be in real trouble," Petersen said.
Aurora police Sgt. Cassidee Carlson says investigators are being careful not to release too much information as they chase down the killer.
"We do have a couple of leads," Carlson said. "We don't believe this was a random act of violence. We do think that for a host of reasons this person was targeted and we're looking into those motives."
On May 26, another licensed medical marijuana caregiver, Richard Nack, was shot and killed at his Denver home.
Mike, a friend of the victim who declined to give his last name, told 9NEWS in June that Nack's grow operation made him a target.
"I guarantee you whoever did it knew exactly what they were after and knew where it was. Having it in his home, on his property, was something that shouldn't be done. My experience with drugs is any time you have something like that involved you have a potential for serious problems to occur and people to get killed," Mike said.
Denver attorney Jessica Peck defends marijuana cases and says FBI and CBI statistics show medical marijuana is less of a draw for crime than other businesses.
"We need to put it in perspective," Peck said. "You are much more likely to be victim at your local bank, at a liquor store, or a pharmacy than you would be at a medical marijuana dispensary. Regulation has worked."
That's little comfort for neighbors like Reil and Petersen.
"That's bringing an element here that we don't want in our neighborhood," Petersen said.
The smell of marijuana was potent standing outside the condominium Monday evening.
9Wants to Know has learned that same condominium was the focus of a drug investigation last year, during which 143 marijuana plants were seized.
That drug bust involved the previous tenant, not Muse.
A check of Muse's criminal record shows he pleaded guilty to a felony drug charge 15 years ago in 1997.
If you have any information in this case, Aurora police ask you to call Detective Alton Reed at 303-739-6068 or you can remain anonymous by calling Crime Stoppers at 720-913-STOP (7867).
You may be eligible to earn a reward of up to $2,000.