Sean “Diddy” Combs, once a music industry icon, now finds himself in an unfamiliar role—competing for attention in the Metropolitan Detention Center (MDC) in Brooklyn, as reported by The New York Post.

According to insiders, the disgraced rapper is “throwing tantrums” over the buzz surrounding fellow inmate Luigi Mangione, who allegedly murdered UnitedHealthcare CEO Brian Thompson.

Luigi Mangione's mugshots

Mangione, 26, entered MDC after his December arrest, quickly overshadowing Combs, who had previously dominated headlines following his September arrest on sex trafficking charges.

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Combs, 55, once relished being the most notorious prisoner in the facility. That changed when Mangione arrived, reportedly receiving a “hero’s welcome” from inmates sympathetic to his alleged anti-insurance crusade.

A source close to the situation explained Combs’ frustration, saying, “Diddy has been throwing tantrums over the fact that Luigi is getting all of the attention in prison and is being revered as a hero after literally murdering someone on camera. Even in prison, Diddy’s ego is bigger than life.”

Feb 1, 2014; New York, NY, USA; Recording artist/rapper Sean Combs aka Diddy performs during the Revolt Party at the Time Warner Cable Studios. Mandatory Credit: Mark J. Rebilas-Imagn Images

It seems the rapper’s penchant for being the center of attention is clashing with the new reality behind bars. A former insider from Combs’ entourage confirmed, “He always wants to be the center of everything. If he feels like anyone takes his attention, he doesn’t take it well. He gets pissed off, and if he has the power to do it, he makes the other person’s life miserable.”

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However, the once-powerful mogul is facing a reality check. With his empire crumbling and the weight of federal charges, Combs' influence is limited, even within the confines of MDC.

Mangione, housed in protective custody, is accused of murdering Thompson shortly after releasing a manifesto condemning insurance companies. The nature of his crime has reportedly resonated with inmates, earning him a level of infamy that Combs can’t seem to rival.

Adding to the tension, both men share the same legal team but have reportedly never spoken. Combs, who resides in general population, is likely to foster what insiders describe as a “one-sided rivalry.”

Sean Combs, photographed in his NYC studio in 2001.

“He’s going to have [Mangione] on his sh*t list,” said a source familiar with the rapper’s mindset. “He has to be the biggest star wherever he goes. It’s all that matters to him.”

Combs’ charges, which include racketeering conspiracy, sex trafficking, and transportation to engage in prostitution, paint a damning picture. Federal raids on his properties earlier this year unearthed a shocking trove of evidence, including hundreds of explicit videos and over 1,000 bottles of lubricant.

Prosecutors allege that Combs hosted events, dubbed “Freak Offs,” where consent was often disregarded.

Both men are facing potentially lifelong sentences, with Combs staring down decades in prison and Mangione up against 11 counts, including first-degree murder in furtherance of terrorism.

For now, the two high-profile inmates are bound to remain under the same roof, though it’s clear that Diddy isn’t taking his diminished spotlight lightly.

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