Suffolk County DA Rachael Rollins’ office filed a nolle prosequi, officially dropping the charges and fully exonerating Sean Ellis.

Evidence

Sean K. Ellis Exonerated of Remaining Wrongful Conviction (New England Innocence Project)

corroborated: 2 independent passages support this claim
XREF: connects to: Ellis’s apparent stumble was mischaracterized by the prosecution. — Lynley Hood, A City Possessed, 2868; The case against Sean Ellis was ‘tainted’ by significant police corruption and prosecutorial misconduct, leading to his full exoneration. — Sean Ellis, wrongly convicted of murder in 1993, is finally fully exonerated; It took prosecutors three trials to convict Sean Ellis for Det. John Mulligan’s murder; Terry Patterson was swiftly convicted in February 1995. — 1995: Three Trials — Justice for Sean Ellis

The case against Sean Ellis was ‘tainted’ by significant police corruption and prosecutorial misconduct, leading to his full exoneration. (similarity 0.87)
It took prosecutors three trials to convict Sean Ellis for Det. John Mulligan’s murder; Terry Patterson was swiftly convicted in February 1995. (similarity 0.87)
Rollins said the case was ‘tainted by significant and egregious police corruption and prosecutorial misconduct.’ (similarity 0.85)
Sean Ellis’s conviction was marred by corruption and was later overturned. (similarity 0.82)
A judge threw out the remaining gun conviction against Ellis, who spent more than 20 years in prison for the killing of a police detective. (similarity 0.78)