A Phoenix woman was charged in connection with the death of a man whose body was found burning and mutilated in a garbage bin earlier this month, police announced Wednesday.

Homicide investigators were �shocked at the casualness� with which Angela Simpson, 33, apparently confessed Tuesday to the killing that left 46-year-old Terry Neely's body so badly charred that police initially could not even determine his gender, according to Phoenix police Lt. Joe Knott.

Simpson reportedly said she'd tell investigators everything in exchange for a candy bar, Knott said.

Firefighters found Neely's body, which was later identified by fingerprint, burning in a trash bin behind Covenant Grace Christian Fellowship Church on Aug. 5, Phoenix police spokesman Luis Samudio said.

Neely's motorized wheelchair was recovered a short distance away a few days later, Knott said.

Beyond video surveillance that showed Neely leaving the Phoenix assisted-living facility, where he lived three days earlier, details surrounding the crime were limited, Samudio said. Police turned to the community, canvassing the area with fliers, which produced several leads, he said.

One of those leads directed investigators to a vacant apartment in the 9600 block of North 12th Avenue, according to Simpson's arrest statement. With the apartment manager's permission, detectives looked around and found bloodstains on the bathroom door, bedroom wall, and along the rails of a crib, the statement said. The carpet had been removed.

After detectives obtained a search warrant, they were able to verify that the blood belonged to Neely, Knott said.

Another lead pointed detectives to a man and a woman who apparently frequented that apartment, both of whom were suspects in a previous armed robbery, he said.

The woman, Simpson, was already in jail, where she was being held on charges related to the robbery two days after Neely's body was found, Knott said. The man was arrested Monday on charges related to the armed robbery. He was interviewed along with Simpson on Tuesday and is currently being treated as an investigative lead.

Knott said Simpson blatantly confessed to killing Neely, nonchalantly describing the crime in �very specific� detail and including elements �only the murderer would know.�

Neely had been stabbed about 50 times, beaten, �crudely� dismembered, strangled, and had a 3-inch nail hammered into his head before being set on fire, police said.

Knott said investigators believe he was �alive for a good part of it.� Knott said he had seen several cases where bodies were mutilated over his 28 years of investigative work, but none had been maimed to the extent of Neely's. Simpson was �adamant� that she had done it all by herself, according to her arrest statement.

The murder was not random, Knott said. In one of several interviews with police, the manager of the apartment told police Simpson believed Neely was a �snitch� and was working with prosecutors, though Knott would not confirm the claim.

According to Simpson's arrest statement, the manager also said he saw a green City of Phoenix trash can in the apartment Simpson visited, which matches the description of the bin in which Neely was found.

The manager also said Simpson asked to borrow his car shortly before confessing to him that she had �killed the guy in the wheelchair,� the statement said.

Video surveillance at a nearby elementary school captured a car matching that description traveling by with something large sticking out of the trunk, the statement said. The video was from the day Neely's body was found.

Though investigators are �not absolutely certain (Simpson) is the only person involved� in the murder, they are �confident that most of the heinous act was committed by her,� Knott said.

Knott believes Simpson would �pose a significant risk to society� out of confinement.

Police will continue to conduct interviews related to the case as investigation is ongoing.

Reporter Julia Guzy contributed to this report.