That was referencing the killer in the Abundant Life Christian School shooting.

This isn't the true crime of classic https://en.wikipedia.org/wiki/True_crime but rather people commenting on crimes.

https://www.wisn.com/article/madison-school-shooting-reveals...

    True Crime Community

    Researchers say these posts and her online actions fit the mold of the internet group "True Crime Community," or TCC.

    The online group often focuses on mass shootings and other crimes, researching and in some cases idolizing previous attacks.

    "TCC and other similar online forums are one location online where individuals who are seeking justification for their desire to engage in violence, to express their anger at society, to express their feeling of being a victim, and they consume content found on those forums," Cohen explained.

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"The "true crime community" of tumblr is really fucked up" - https://www.reddit.com/r/tumblr/comments/7e7v0b/the_true_cri...