Kristin Murphy, Deseret News
FILE - Scene of a fatal plane crash on I-15 in Riverdale on Wednesday, July 26, 2017. All four people on board died.

RIVERDALE, Weber County — Relatives of a couple killed in a plane crash in Weber County in July are suing the relatives of the other couple killed in the same crash, according to court documents.

McKenzie Huffaker, a daughter of Perry and Sarah Huffaker who is listed as a representative of their estate, filed a wrongful death lawsuit in 2nd District Court on Friday against Donette Crayton, who represents the estate of Layne and Diana Clarke.

On July 26, the two couples took off from Ogden-Hinckley Airport in a Beech A36 Bonanza to go to Island Park, Idaho, together. The plane crashed moments after takeoff into the median of I-15 in Riverdale, killing both couples.

Witnesses at the airport told the National Transportation Safety Board that they could tell by the sound of the plane at takeoff that something was wrong.

"When the airplane first came into view they stated it was about 100 feet above the ground, and that it should be about 500 feet or higher at that location," the NTSB report stated. "As the airplane passed by, they noticed the engine sound was underpowered and the tail of the airplane going up and down, as if the pilot was struggling to keep the airplane at altitude."

A final report by the NTSB to determine a possible cause of the crash was not posted on their website as of Saturday.

In the lawsuit, the estate of the Huffakers claims that the Clarkes were negligent by "failing to use reasonable care in the ownership and or operation of the airplane."

At the time of their deaths, Steve Cottle, the Clarkes' LDS bishop, told reporters that the Clarkes and the Huffakers were close friends and going on vacation together when the plane crashed.

Layne Clarke's brother Corry Clarke also died in a plane crash in 2002, according to an obituary. The Clarke brothers were business partners in High Country Aviation, the company that manufactured the aircraft.

The estate of the Huffakers is seeking unspecified damages to be determined in court by a jury.