Nothing seemed wrong as Lisa Fisher hopped into a car with her overnight bag packed.

Fisher had plans to spend time with Christopher Pena, whom she had known for about five months.

He picked her up from her longtime job at O’Hare International Airport late Tuesday and took her to her Broadview home, where she changed and saw her family.

“Everything seemed normal,” said her eldest son, 30-year-old Leon Williams. “There was no indication that she was in any kind of trouble.

“She got in the car, and I’m sad to say that was the last time I saw her alive,” Williams said. “She said, ‘See you in the morning.’ ”

But something was wrong by the time the couple pulled up to a toll booth on the Chicago Skyway at 87th Street around 4:10 a.m. Wednesday, according to police. While Pena dug for change, Fisher told the toll worker in a low voice, “Help me.”

As the red Chrysler 300 slowly passed through the gate, Fisher jumped out and Pena followed, letting the car roll away, police said.

He fired and Fisher fell, then he stood over her and fired more, police said. As an officer approached, he raised the gun to his head and pulled the trigger. Both were pronounced dead at the scene.

The two met at Fisher’s second job and began dating, according to Fisher’s identical twin sister, Lynda Fisher-Brown. Fisher had decided to break it off, but Fisher-Brown didn’t know if she had told Pena yet.

“Whatever happened, happened in the car,” she said. “I know my sister and she would not have gotten in that car if she thought she was in danger.”

Fisher, 49, supported her family working two jobs, Fisher-Brown said. She lived with her two sons, her 8-year-old granddaughter, Giada, and a daughter-in-law. Fisher-Brown lived next door, and the twins spoke nearly every day.

“She was a very giving, cheerful, loving, do-anything-for-anybody type of person,” Fisher-Brown said. “She took care of her family. She was the breadwinner.”

The sisters grew up on Chicago’s West Side and graduated from Flower High School in 1985.

Their mother died when the twins were 10. They had five brothers and six sisters.

Fisher took a few college courses before moving to Palos Hills.

About three years ago, she moved to Broadview with her family.

rsobol@chicagotribune.com