A Brooklyn man was hit with manslaughter charges Tuesday for allegedly fatally hitting a motorcyclist while speeding and driving drunk — then trying to pass the blame onto his girlfriend by claiming she was behind the wheel, prosecutors said.

Christopher Diaz, 24, was arraigned in Brooklyn Supreme Court, where he pleaded not guilty to 17 counts, including second-degree vehicular manslaughter, second-degree assault, first-degree reckless endangerment, criminally negligent homicide as well as conspiracy charges over the collision in the early morning hours of May 27.

Diaz was driving a 2014 Infiniti sedan, registered to his girlfriend, at 80 mph in a 25-mile an hour zone on Ocean Parkway in Kensington when he slammed into 28-year-old Evvon Alexander at the intersection of Ocean Avenue and Beverly Road, according to the Brooklyn District Attorney’s Office.

The car hit Alexander so hard that it split his motorcycle in half, and the force threw him over a median and into parked cars on an adjacent service road, the DA said.

The rider was rushed to a hospital, but could not be saved.

Diaz’s girlfriend, Jasmin Morales-Cruz, 23, initially took the fall for the fatal crash, telling police that she had only one drink while Diaz had numerous drinks.

Two passengers in their car initially backed them up in their ruse, but days later admitted that it was actually Diaz behind the wheel — and he copped to drinking six to eight beers, the DA said.

The DA’s office said it conducted a “lengthy” investigation into the incident that turned up surveillance footage of the group hitting three bars and Diaz hopping into the driver’s seat prior to the collision — as well as text messages in which the passengers were asked to lie to police.

Other evidence showed that Diaz allegedly sped up from 65 mph to 83 mph just moments before the collision.

Morales-Cruz also faces obstruction and conspiracy charges.

Diaz’s bail was set at $400,000 bond or $200,000 cash and he was ordered to return to court on Sept. 23.

He faces five to 15 years behind bars if convicted of the top count.