SHELTON— Two of the three cars involved in the horrific April River Road crash were racing at speeds approaching and exceeding 80 miles per hour as they passed cars heading to a Stratford restaurant.

The warrant signed by Police Det. John Hubyk and reviewed by Supervisory Assistant State’s Attorney Cornelius P. Kelly accused Abdulaziz Yuldoshev, 19, of Hamden racing Lawrence Carter on sections of the River Road, also known as Route 110, where the speed limit ranges from 35 to 45 mph.

Shelton police conducted an intensive investigation in which they spoke to several other drivers who witnessed the race, people at a going away party which the two drivers attended and analyzed store surveillance videos as well as information stored in the event data recorders inside the air bag control modules of the cars involved. Fairfield police assisted Shelton in accessing that information using a Bosch Crash Data Retrieval tool.

Yuldoshev was arrested on a number of charges Monday including manslaughter,negligent homicide with a motor vehicle, first degree assault and illegal racing. He was released after posting $50,000 bond pending a June 28 appearance in Derby Superior Court.

It is expected that the case will be transferred to Milford Superior Court where more serious charges are heard and where Kelly is a prosecutor.

Killed in the crash were Carter’s wife, Briana Torres-Carter and her eight-month fetus, and Shalymar Herrera, 18, of West Haven. A fourth person in the car, Jessie Abrams 19 of Bridgeport.

The four and Yuldoshev were part of a group which included friends from the Bridgeport Military Academy conducting a going away party at the Shelton Rinks and Sports Complex. Abrams was being deployed to Germany. Herrera was an Academy graduate.

Carter lost control of his Mini Cooper while being passed by Yuldoshev’s Toyota Camry which crossed the double yellow line, entered the north bound and then the south bound lane just before the intersection with Quail Court. Carter’s car then went into a hard skid and collided with a 2007 Saturn Ion traveling north bound and being driven by Caitlin Kalafus, 25, formerly of Milford now living in Pennsylvania. Both vehicle spun out of control and struck guard rails. Carter’s car slid sideways into the guard rail.

Kalafus, her sister, Carly, 22, and a third passenger, Paul Valleau, 26, suffered numerous broken bones. The Kalafus sisters are musicians who performed with Kicking Daisies and are now in Like Violet. Their father, Christopher, is a music teacher in the Milford School system.

Police said Yuldoshev returned to the scene following the crash and was interviewed by police. During the interview he eventually admitted to Det. Richard Bango that he and Carter were “going fast” and passed a car. Yuldoshev said no one was drinking or had done drugs while at the party.

One witness told police that a Snap Chat video made by Herrera, one of the women killed in Carter’s car, was captioned “he’s going crazy” with a crazy face emoji, Hubyk’s affidavit reads. “I then heard what sounded like someone saying “don’t give in, don’t give in.”

Using one of the surveillance videos police used a timer and measurements to determine that at one point Yuldoshev was traveling at 78.9 mph near the Citgo Food Bag and was at 84.4 mph near the Cumberland Farms gas station.

At least five people, including three who were driving on the River Road, gave statements to police.

Detective Christopher Nugent said additional arrests are expected.