A man convicted of murdering two women whose cases are featured in the show “Unmasking the Zombie Hunter” is lamenting about the poor-quality food and cold cells behind bars, CBS News reports.

In an email exchange with a producer for the true crime show “48 Hours,” Bryan Patrick Miller described his experience so far at the Eyman Prison Complex in Florence, Arizona.

“[I]t is far from great, as I am even more isolated from those I care about and also my legal team, the food is still not great and the cells are getting very cold now that temps are falling,” Miller wrote, according to the news outlet.

Miller is on death row for murdering 21-year-old Angela Brosso and 17-year-old Melanie Bernas. Brosso was found dead in November 1992. She was naked and decapitated when discovered near a canal. Investigators believe she was sexually assaulted, according to Fox 10.

About a year later, in September 1993, Bernas’ body was also discovered in the canal. Her body had been mutilated and authorities believe she was raped as she died.

The slayings stumped investigators for decades until DNA analysis helped crack the case. Miller, now 50, has denied killing the women, but he has been unable to explain how investigators found his DNA – from semen – on both victims’ bodies.

A judge found Miller guilty of the murders in April and sentenced him to death in June. That triggered a state law requiring an automatic appeal, which is pending, according to the Arizona Republic.

Police also believe Miller murdered a 13-year-old girl, Brandy Myers, who vanished in 1992 but has never been found.

Because he is on death row, Miller is being held in the prison’s Special Management Unit.

“It is better than county jail, but it is obvious that isolation has taken its toll on many people here. From what I saw of people in county jail compared to here, the majority of the people here are by far not what I would consider the worst of the worst. It is by far safer than anywhere else in prison even though they have nothing really to lose anymore,” Miller wrote to CBS.

The murders, also known as the canal killings, are the subject of a new show streaming on Paramount+ entitled “Unmasking the Zombie Hunter.”

The show follows investigators after identifying Miller as a person of interest in 2014. By that time, Miller had started participating in so-called “zombie walks” around Phoenix. He had created a costume in which he wore a mask, carried a fake Gatling gun and drove an old police car with the words “Zombie Hunter” affixed to the back, according to the Arizona Republic.

During trial, Miller’s attorneys argued that his mother abused him when he was a child, which they said left him with mental health challenges.

Featured Image: Bryan Patrick Miller dressed as the Zombie Hunter via Facebook (Left), Bryan Patrick Miller via Maricopa County Sheriff’s Office (Right)