Investigation Discovery will premiere its documentary, "Who Is Luigi Mangione?" on Monday, Feb. 17, 2025. In this file photo, Mangione, charged in the fatal shooting of UnitedHealthcare CEO Brian Thompson, is escorted by police, Thursday, Dec. 19, 2024, in New York. AP

Writings and social media posts help reveal the secret life and troubles of Luigi Mangione, the man accused of killing United Healthcare CEO Brian Thompson in Midtown Manhattan on Dec. 4, 2024, Investigation Discovery says.

Investigation Discovery's 'Who is Luigi Mangione?' tell-all used narration from digital archives — including his own online posts and Reddit comments

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Watch the show live streaming online: Who is Luigi Mangione? for FREE with Philo (free trial). If you prefer a different streaming platform, you can also watch it on Fubo (free trial). If you prefer a different streaming platform with DirecTV Stream (free trial). You can also watch it on Max (promotional offers).

Fans of true crime can tune in to the Who Is Luigi Mangione? premiere on Investigation Discovery’s cable and satellite channels. For those who prefer to watch on-demand, the documentary will be available for streaming on Max.

Who is Luigi Mangione?” premieres Monday, February 17 at 8 p.m. ET on Investigation Discovery. Here’s how to stream the new documentary special for free.