The man who killed 19 children and 2 adults in the latest shooting massacre was planning on killing a woman on social media weeks before his act.

A female minor in Los Angeles says the 18-year-old suspect contacted her out of the blue and for no apparent reason at all, explaining she has no idea who he is or why he reached out.

The alleged shooter tagged her in a photo he posted of his guns and then proceeded to start a private chat.

The most chilling of the many disturbing messages he sent was this one. Apparently, he never revealed his exact intentions -- dancing around the subject/playing coy as the girl engaged him.

The man went back and forth with her for a while, telling her she should be grateful he tagged her. The girl didn't know what he was talking about.

In the aftermath of Tuesday's onslaught, the girl revealed her messages and explained that she only engaged him to try to deter him from committing a horrible act.

After shooting his grandmother, the shooter went to Robb Elementary School in Uvalde, Texas, where he barricaded himself in classrooms and opened fire, eventually getting taken out by law enforcement.

Texas School Shooting Victims

He was said to have been armed with a rifle and a handgun during the bloodshed, and loaded up on heavy weaponry on his 18th birthday, all of which seem to have been obtained legally.

Robb Elementary School Shooting -- Police On The Scene Shutterstock Premier

It is the worst mass shooting in the US that has happened in some time, comparable to the Sandy Hook tragedy. Less than 2 weeks ago, 10 people were killed in a mass shooting in Buffalo.