By Nathan Koppel and Laura Stevens 

A suspect who allegedly shot and killed six family members Wednesday in a Houston suburb was believed to be searching for his divorced wife who was related to the victims, according to new details from authorities.

Posing as a parcel delivery driver, alleged gunman Ronald Lee Haskell, 33 years old, entered the Spring, Texas home of Stephen and Katie Stay on Wednesday. Photos of his arrest at the scene showed he wore a black and purple shirt that resembled those assigned to FedEx Ground drivers.

Mr. Haskell was believed to have been searching for his former wife, Melanie Kaye Haskell, who is a relative of the Stay family, according to Harris County Constable Ron Hickman. He added Mr. Haskell's ex-wife and his children evidently had traveled to the Houston area, but offered no other details about them.

Mr. Haskell allegedly opened fire on the Stay family, killing the parents, Stephen and Katie Stay, and four of their children, Mr. Hickman said. One of the Stay children, a 15-year-old girl, was shot and "played dead," waiting for the gunman to leave her home before she called 911, according to authorities. Mr. Haskell was later arrested and detained after a multi-hour standoff.

"I've never seen a situation where a person has killed so many members of a family," said Mr. Hickman, who called it the worst such crime he could recall in his 43 years of police work.

The 15 year old is in critical condition at a Houston hospital, according to a spokesman with the Harris County Sheriff's office.

She was able to tell police that Mr. Haskell allegedly intended to travel to another family member's house in the area and "cause additional harm," the spokesman said.

Mr. Haskell has been charged with capital murder and is scheduled to make his initial court appearance on Friday. He had not yet entered a plea in the case nor been assigned an attorney as of Thursday afternoon.

Mr. Haskell finalized a divorce with his ex-wife earlier this year. A protective order was filed against Mr. Haskell in Cache County Court in Utah by Mrs. Haskell on July 8, 2013, according to court documents. During the court proceedings, Mr. Haskell continued to have supervised parenting time pending a Department of Children and Family Services investigation, according to the documents.

A Logan City Police Department spokesman said Mr. Haskell was arrested in June 2008 for domestic assault and domestic assault in front of a child. He was released the next day, after entering a plea in abeyance, the spokesman said--a deal that allows for criminal charges to be dismissed if a defendant meets conditions imposed by a court. Police also responded to a complaint from his wife in October that Mr. Haskell showed up at their children's school.

In October, the Haskells entered into a mutual restraining order as part of their divorce, according to the court document. The agreement gave Ms. Haskell primary custody of the children. Mr. Haskell's time with his children would be supervised "until such time that his physical therapist can report that the respondent is no longer a threat to the children." He also agreed to pay $773 in child support monthly.

Mr. Haskell previously worked as a FedEx Corp. driver in Logan, Utah, and the company identified him as a top finisher at the 2013 Utah State Truck Driving Championship in a news release on its website.

"Our heartfelt thoughts and condolences go out to all those involved in this tragic incident. Mr. Haskell formerly provided service for FedEx, but has not done so since January," FedEx said in a statement.

FedEx Ground doesn't directly employ its drivers, instead using an independent contractor system. Mr. Logan was a driver for Klien P&D Inc. according to the FedEx news release. Ricky Klien of Klien P&D declined to comment.

A Facebook page that appeared to belong to Mr. Haskell showed a photo of a clean-shaven man posing with a woman and three children, as well as one of him strapping a little girl into rock climbing gear. It says he attended Chugiak High School in Alaska and lives in Logan, Utah.

Lisa Schwartz contributed to this article

Write to Nathan Koppel at nathan.koppel@wsj.com and Laura Stevens at laura.stevens@wsj.com

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