Patterson has been charged with two counts of intentional homicide and one count each of kidnapping and armed burglary.
He said they he confessed to the crime in great detail because he didn't want deputies to put Closs through an interview.
A letter sent to NBC affiliate KARE 11 reporter Lou Raguse, in Minneapolis says it is from the Polk County Jail, and the sender is Jake Patterson, the man accused of kidnapping Closs previous year.
Patterson's attorneys did not immediately respond to messages from the Associated Press.
In a handwritten letter obtained by Radar Online, Patterson, wrote about spending time with 13-year-old Jayme and decorated the letter with heart symbols around her name. Outgoing correspondence is reviewed before it is mailed. "They did anyways and hurt her more for no reason".
Under a question of whether he's remorseful, he describes "huge amounts" of remorse and adds, "I can't believe I did this". ". It was really stupid though looking back".
KARE 11 News said the letter from the Polk County jail was sent to one of its reporters who wrote to Patterson asking him whether he had any remorse or regret for the crimes. In much smaller print, Patterson added: "For everything". 'I want Jayme and her relatives to know that.
Patterson was charged in February with murder for the October 15 shooting deaths of Closs' parents in Barron, Wisconsin, and for kidnapping the girl he is alleged to have targeted seemingly at random after spotting her boarding a school bus.
The home where 13-year-old Jayme Closs lived with her parents James and Denise in Barron Wis. on Oct. 17 2018
Prosecutors say the former cheese factory worker spotted the girl getting off a school bus near her home and decided he was going to take her. Patterson had no other prior contact with Closs or her family before the night he busted down her front door and started shooting. She was held for 88 days in a home in Gordon about an hour away until she escaped in January. Patterson was arrested shortly afterward.
"The cops say I planned this thoroughly, and that I said that", the letter says. "I don't think like a serial killer".
"I knew when I was caught (which I thought would happen a lot sooner) I wouldn't fight anything".
While he was allegedly holding Jayme hostage, the letter says, the suspect followed news updates on the kidnapping on his phone but would change the channel if it appeared on television.
"No one will believe or can even imagine how sorry I am for hurting Jayme this much".
He continued: "At the time I was really pissed". "I most definitely want Jayme's family to know, everyone to know, that our hearts are broken for their family". "The reason I did this is complicated".
Barron County Sheriff Chris Fitzgerald said letters are only given to the inmates they are addressed to after they have been opened and read by jail staff.
Fitzgerald said he was aware Patterson had sent a letter to Raguse.
