Former Suffolk County District Attorney Thomas Spota and his top aide will be sentenced on April 30.
Spota and the aide, Christopher McPartland, were convicted last month on federal charges in the latest public corruption trial of Long Island officials. They each face up to 20 years in prison.
The jury found that Spota and McPartland conspired to cover up the 2012 beating of a handcuffed man by then-Police Chief James Burke.
They were also found guilty on charges of witness tampering, obstruction of justice and acting as accessories to a civil rights violation.