Two people sit behind a police car as Miami police officers investigate a murder on Thursday, Aug. 8, 2013 in Miami. Derek Medina, who authorities say fatally shot his wife — and apparently then posted a photo of her body on Facebook — turned himself in to police on Thursday.

Florida Murder Suspect Shares Victim's Body on Facebook

Derek Medina allegedly uploaded a photo of his dead wife following a confession post.

Two people sit behind a police car as Miami police officers investigate a murder on Thursday, Aug. 8, 2013 in Miami. Derek Medina, who authorities say fatally shot his wife — and apparently then posted a photo of her body on Facebook — turned himself in to police on Thursday.
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Authorities arrested a Florida man late Thursday after he reportedly uploaded a post to Facebook confessing to the murder of his wife. A second post included a photo of his dead wife.

According to the affidavit, Derek Medina, 31, had a gun pointed at his wife, Jennifer Alfonso, 26, during a fight in an upstairs bedroom of their Miami townhouse. Medina said he followed Alfonso down to the kitchen when she left the room after saying she was "leaving him." He said she began punching him with a closed fist and he went back upstairs to get his gun.

Alfonso reportedly armed herself with a kitchen knife when Medina returned to the kitchen with a gun in his hand. He was able to disarm Alfonso by taking the knife and placing it in a drawer. He said she then began punching him again, which prompted him to shot her several times, according to the affidavit.

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See a copy of the affidavit below.

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"I'm going to prison or death sentence for killing my wife love you guys miss you guys takecare Facebook people you will see me in the news' my wife was punching me and I am not going to stand anymore with the abuse so I did what I did I hope u understand me," the post read.

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Medina posted two videos to YouTube earlier in the week that show him punching and kicking a heavy bag in a martial arts studio.

WFOR-TV reported the picture depicted Alfonso bent over backwards at the knees and her head in the corner what appeared to be the couple's kitchen, with blood on her face and left arm. Authorities discovered Alfonso's body when they arrived on the scene, as well as an unharmed 10-year-old girl.

In an email to the Associated Press, a Facebook spokeswoman said that she could not comment on the law enforcement investigation, but that Facebook "took action on the profile – removing the content and disabling the profile and we reached out to law enforcement.

"We take action on all content that violates our terms, which are clearly laid out on our site," she said in the email. The post reportedly remained online for five hours before being taken down.

[READ: Authorities Launch Nationwide Hunt for Murder and Kidnapping Suspect]

Neighbor Phil Eby told the Associated Press that although he did not know the couple well, he had met Medina "a couple times. He seemed like a pretty nice guy."

The Miami Herald linked to a blog by Medina used to promote a series of self-published e-books. A book published in February, "How I Saved Someone's Life and Marriage and Family Problems Thru Communication," provides marriage counseling tips and stresses the importance of communication.

"The author discusses how life is surrounded by communication and how vitally important it is – you can't survive the world without it," the blog reads.

According to Miami-Dade County records, Medina and Alfonso were issued marriage licenses in January 2010 and April 2012.

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Affidavit