Computer data from a Fort Lauderdale police cruiser showed an officer was driving about 90 mph in a 40 mph zone when he hit and killed a Lauderdale Lakes woman on South Federal Highway, according to a search warrant.

Traffic homicide detectives are investigating the death of Althea Tobias McKay, 39, on June 19 as a vehicular homicide, the police search warrant says. The officer, Alexander Griss, 23, has not been charged with any crime.

The warrant was used to obtain data from computer systems in Griss' 2001 Ford Crown Victoria Police Interceptor. The data showed he had accelerated on Federal Highway in Fort Lauderdale to 91 mph before the car slammed into McKay about 5:21 a.m., throwing her body 102 feet, the warrant said.

Police have said Griss was about to go off duty and was not responding to an emergency call when the crash occurred.

Griss' attorney, Michael Dutko, said Thursday that if charges are filed, he will challenge the data investigators used to determine the officer's speed.

Griss remains on paid administrative leave for the duration of the investigation and cannot carry a firearm, perform any police duties or work off-duty details. Police declined to comment on the case because it is still being investigated.

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Police have said McKay stepped off the curb at Southeast 21st Street onto Federal Highway about 5:21 a.m. when she was struck by Griss' cruiser. His cruiser then hopped a concrete median, crossed into oncoming traffic and skidded to a stop in a vacant field with two flat tires and extensive front-end damage, the warrant said.

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Traffic homicide investigators also used skid marks and complex formulas to determine Griss was driving "at minimum" 79 mph at impact, the warrant says.