Kennedy was facing 25 years in the crash that killed a 54-year-old man in 2022.
Prosecutors are urging a Manhattan judge to deny Diddy's latest $50 million bail package.
The One Direction singer died following a fall from a hotel balcony in Argentina, aged 31.
The hip-hop mogul's lawyers argued that 19 pages photographed by an investigator during the sweep are protected by attorney-client privilege.
The British pop icon appeared as a talking head in the Boybands Forever series and also responded via social media.
The case claims attorney Tony Buzbee is financially exploiting Diddy's downfall by threatening to link "innocent celebrities" to the rapper's alleged crimes.
Days after prosecutors accused the rapper of trying to obstruct justice from jail, his lawyers level serious allegations of their own in response.
Combs had family carry out a social media campaign on his birthday "with the intention of influencing the potential jury in this criminal proceeding," prosecutors claim.
The country singer's wife gave an update following the hunting accident.
Porter died at age 47 from lobar pneumonia.
