Facebook has proven to be good for something but in a sad way. A chance post by 21-year-old Octavia Barnett just moments before she was shot to death may have led police to her suspected killer.

The mother of two posted a status update saying her ex-boyfriend, Lineten Belizaire, was at the door of her Florida home. Not long after, she was shot dead along with her friend, Natasha Plummer, and her six-month-old son, Carlton Stringer Jr. Octavia’s 11-month-old son was found in her dead arms and was the only survivor of the shooting. Police believe he was spared by Lineten because he’s his son.

Investigators only revealed part of Octavia’s last post in which she wrote the phrases “open the door” and “who is it.” She also referred to her 11-month-old son, writing “your daddy came back from out of town from 4monthes [sic] ago better late then [sic] never.”

With no leads after police arrived on the scene, they say her last posting was crucial to the case.

“Octavia Barnett’s last posting actually pointed to the suspect, and thankfully she did that because that one post on Facebook could be the thing that brings justice to this case,’ said Broward County Sheriff Al Lamberti.

“There was no 911 call at that time. There was an entry on her Facebook page indicating he was at her door. We believe that shortly after that post is when the incident occurred.”

Sgt Dave Elwood, agreed:

“I don’t know if that was her intention at the time. I don’t know if she had a feeling or some kind of premonition, but it definitely has become helpful in this case, extremely.”

It’s supposed to be the most wonderful time of the year, but for many Christmas turns out to be the most stressful. On Saturday, an ex-NYPD cop snapped under the financial pressures of the holidays after buying his wife a Louis Vuitton handbag for Christmas. When the couple got into a heated argument about money, Clarence Cash, 49, shot and killed his wife.

According to the NY Post, Cash, calmly told officers, “I just shot my wife,” after allegedly firing 10 bullets into Tracey Young, 42, in their Queens Condo. Young was a top tax investigator who specialized in busting tobacco smugglers. Cash detailed the whole act to cops, saying he shot his wife three times in the face, adding, “My wife, she didn’t deserve that.’’

Cash reportedly went completely over the edge when in the midst of their financial argument, he punched Young and she threatened to leave him. Neighbors admitted that they heard the couple arguing, then loud bangs — but no one called the cops, despite suspected gunfire.

After the incident around 10:30 pm, Cash told cops he wandered the city for more than seven hours trying to work up the nerve to commit suicide. Eventually, he turned himself in around 6 am yesterday, handing over two handguns.

Cash, who supposedly appeared remorseful, was charged with first-degree murder and remanded without bail. Because he is an ex-cop, his lawyer asked that he be placed in protective custody at Rikers.

Neighbors said the couple, who was married a few years ago and had no kids, was last seen arriving home in Cash’s black Mercedes at about 9 pm Saturday.

“They seemed fine when they got on the elevator,” one neighbor said.

Building resident Maple Dong, 28, said Young had recently told her Cash “bought a lot of gifts for her for Christmas,” including the handbag.

“She said, ‘I asked for it, and he bought it for me,’ ” Dong said.

But apparently Cash couldn’t really afford it. According to public records, he’d been hit with federal tax liens, multiple civil judgments, and warrants from New York State for failing to pay back taxes dating to at least 1998.

In sad irony, Young’s own mother was murdered by a lover when she was just a child, a neighbor said.

Brande Victorian is a blogger and culture writer in New York City. Follower her on Twitter at @be_vic.

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Nicholas Telemaque, cousin to female MC Nicki Minaj, was killed early Monday morning after being shot several times in the chest. His family believes that the 27 year old Brooklyn native was not the intended target of the shooting.

Another cousin, Carol Clarke, told Radar Online that Nicholas was a good person.

“Nicholas was a quiet person but he could be the life and soul of the party too – he did not run with gangs or anything like that.”

Telemaque was shot at 2:40 am in Flatbush, Brooklyn after leaving the C-PAC club with a group of friends.

Clarke also told Radar Online how the rapper and the rest of their family was taking the news.

Nicki is absolutely devastated as are all our family – she was very close to her cousin but now he has gone. She has reached-out to Nicholas’ mom Victoria to offer her words of comfort but she is too distraught.”

After hearing the news about her older cousin, Minaj tweeted this: “Lived in Brooklyn his whole life. My precious cousin. My baby. Killed last nite.”My cousin Nicholas. Also goes by Juse, or @brolicalcoholic* Murdered. Last nite. Near his home. Brooklyn,NY.