Derek Medina
Miami-Dade Police Department handout photo of Derek Medina. Reuters

Newly released surveillance video shows Derek Medina, the Miami man who allegedly killed his wife and then posted a picture of her dead body on Facebook along with an alleged confession to her murder, walking into a police station to turn himself in.

RELATED: Derek Medina, Miami Man, Murders Wife Jennifer Alfonso Then Posts Bloody Body Photo To Facebook [PHOTOS AND VIDEO]

In the footage that was released Sunday, Medina is seen entering the station with his father, speaking to the clerk and then sitting in a chair in the lobby.

The 31-year-old man, told South Miami police Thursday that he killed his wife after an argument. Miami-Dade police told reporters that it appears that he shot her. In the social-media confession, Medina said his wife, Jennifer Alfonso, had been punching him.

"I'm going to prison or death sentence for killing my wife. Love you guys. Miss you guys. Take care. Facebook people you'll see me in the news. My wife was punching me and I'm not going to stand anymore with the abuse so I did what I did. Hope u understand me," Medina's post read. His profile has since been removed.

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When officers later responded to Medina's South Miami home, they found Jennifer Alfonso's body inside, as well as her 10-year-old daughter, who was unharmed.

CBS Miami said Medina appeared in court wearing a protective vest reserved for psychiatric inmates and those on suicide watch.

He is being housed in the ninth-floor psychiatric ward of the county jail pending his arraignment in 21 days on charges of first-degree murder, according to the Miami Herald.

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According to the affidavit, the 6-foot-2, 200-pound Derek Medina said the couple became involved in a heated argument in an upstairs bedroom when he armed himself with a gun and pointed it at her.

He said Alfonso left the bedroom, returning later to say she was leaving him. He says he went downstairs and confronted her in the kitchen, when she began punching him. He claims he went back upstairs to get his gun and confronted her again, at which time she grabbed a knife.

Medina said he was able to disarm her and put the knife in a drawer, but that when she began punching him again, he shot her several times, the affidavit says.

Family and friends on Friday gave contradictory statements about the couple's stormy marriage, with each side accusing the other spouse of psychological and physical abuse.

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