Man jailed for crashing his car while having sex with his wife, killing her.

A Florida man has been sentenced to five years in prison for his involvement in a 2014 car wreck that killed his wife, 31-year-old and mother of two, Amanda.

During his trial, Matthew Notebaert explained that he and his wife were enjoying a night out at a concert on March 8, as part of a Valentine’s Day present, the Palm Beach Post reports.

It was their first night out together since their second child, a daughter named Stacey, had been born.

The couple - who relatives have described as being "madly in love" - had snuck a flask into the concert and had been drinking from it all night. On their way home, they pulled over and starting becoming intimate.

Notebaert said that when he started driving again, Amanda was sitting on his lap. The next thing he remembers is waking up in a crashed car next to her body.

Investigators say Notebaert had crashed into a canal back so hard, the couple's car was airborne for nine metres. Amanda's head hit the dashboard and windshield, and she died at the scene.

Toxicology reports found Matthew was nearly twice the legal blood alcohol limit and also had marijuana in his system.

On Wednesday, almost three years after the accident, a Palm Beach County judge sentenced the husband and father to five years in prison. Circuit Judge Laura Johnson called it one of "the most senseless, tragic acts" she had ever seen.

"I miss her more than words can express," Matthew Notebaert told the judge during his trial.

Amanda's parents, Lisa and Mike Stacey, blame Matthew for their daughter's death.

"You had a responsibility to get your wife home safely," Mike Stacey told his son-in-law in court.

He asked Johnson to give Matthew the "maximum allowable sentence" of ten years.

In sentencing Matthew, Judge Johnson said "this isn't your first chance...you've been to jail before".

"You failed your wife, you failed your children and you failed all your family that is here today," she said.