Man details daugther's murder on Facebook

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Merrick McKoy (right) shot and killed his 19-month-old daughter, Mia McKoy-Phanthavongsa, before turning the gun on himself.

A jilted Colorado man captured the moment just before he shot his own daughter and then wrote about it on Facebook.

Merrick McKoy gunned down his 19-month-old daughter, Mia McKoy-Phanthavongsa, in an attempted murder-suicide in the Westminster area, according to reports.

Just before the cowardly McKoy, 22, allegedly shot his daughter in the head and killed her, he posted a photo of the two together and wrote several social media missives explaining his motive.

'I told u I can't live without u lol u thought I was joking now me n Mia out this b----,' he wrote on his Facebook page.

The little girl's mother, Kimphone 'Kim' Phanthavongsa, 21 had an active restraining order against McKoy following domestic violence incident. McKoy was charged with assault, burglary, trespassing and harrassment, ABC7 Denver reported.

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The Monday shooting was his only way out, he reasoned in his final Facebook post.

'Don't judge me had no choice,' he wrote.

Phanthavongsa, 21, frantically phoned police to report McKoy was in her Stuart St. apartment with a gun. The two had a heated argument and she stormed out on Monday.

Cops did not make it in time. McKoy shot the girl in the head and then turned the gun on himself. The father's condition was not released.

Little Mia's relatives painted McKoy as a jealous and possessive brute.

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'He was the type to say, if you're not with me, you can't be with anybody else,' Smaly Chham, the girl's cousin, told 9NEWS, a local NBC affiliate.

Little Mia had just hit had just hit a major milestone - her first steps - according to friends who knew the little girl.

'She just learned how to walk,' Vannatda Sivixai told ABC7 Denver. 'What an angel. Whenever she smiled it was bright.'

idejohn@nydailynews.com

@IrvingDejohn