Mary Gough was murdered in 2003 by her husband, Colin Whelan, just months after their wedding. Whelan strangled her at their home in the UK and attempted to stage her death as an accident before fleeing. He was later captured in Ireland, convicted of her murder, and sentenced to life in prison.

https://www.mamamia.com.au/mary-gough-murder/

The Lonely Hearts Killer refers to Raymond Fernandez and Martha Beck, a murderous couple who lured victims through personal ads in the 1940s. Posing as lovers, they gained the trust of lonely women, then robbed and killed them, with Beck often displaying intense jealousy. They were arrested in 1949 and executed in the electric chair in 1951.

https://en.wikipedia.org/wiki/Raymond_Fernandez_and_Martha_Beck

Rachel McLean, a 19-year-old university student in Nottingham, England, was murdered in 1991 by her ex-boyfriend, John Tanner. Tanner strangled her in her own home and later attempted to mislead the police by participating in media appeals for her return. His inconsistent statements led to his arrest and conviction, resulting in a life sentence.

https://en.wikipedia.org/wiki/Murder_of_Rachel_McLean

Murdered on her wedding day in her wedding dress, the groom flies out the second story window....

https://vocal.media/criminal/she-died-ten-hours-after-getting-married

Our first serial killer!  This bridal shop got more than they bargained for...

https://people.com/6-store-clerks-murdered-i-70-30-years-people-magazine-investigates-7561699

Neighborhood swingers end up with deadly consequences..

https://abcnews.go.com/US/unholy-matrimony-investigators-solved-love-triangle-murder-case/story?id=98348366

Who knew Ikea could be so deadly?

https://www.dailymail.co.uk/news/article-1313961/Newlywed-murdered-wife-discovered-affairs-jailed.html

What happens when an ex shows up on your big day? 

Gladys Ricart was tragically murdered on her wedding day on September 26, 1999, in Ridgefield, New Jersey. As she was handing out flowers to her bridal party before heading to the church, her ex-boyfriend, Agustin Garcia, entered her home.

Garcia, who was reportedly enraged by their breakup and her upcoming marriage to another man, shot Gladys three times in front of her family and friends. He was immediately apprehended at the scene and later convicted of first-degree murder.

This horrifying act of violence shocked the community and highlighted the dangers of domestic violence, even after a relationship has ended. Gladys' story has since been remembered as a tragic reminder of love turned deadly.

https://www.cnn.com/2014/03/27/justice/montana-newlywed-sentenced/index.html

What happens when a custom song for your wedding becomes the ominous foreshadowing of your demise?

A rare Bride who "dunnit" episode... Less than nine months after she shoved her husband off a steep cliff justice was served!

https://www.cnn.com/2014/03/27/justice/montana-newlywed-sentenced/index.html

How do you make your entrance to your nuptials memorable? This grand entrance will never be forgotten...

Rosemere do Nascimento Silva, a Brazilian bride, tragically died in December 2016 while en route to her wedding in a helicopter. She planned to surprise her fiancé and guests with a dramatic entrance at the ceremony in São Lourenço da Serra, São Paulo.

The helicopter, carrying Rosemere, her brother, the pilot, and a photographer who was six months pregnant, crashed in dense fog just a mile from the venue. Sadly, all four passengers were killed on impact.

Investigators later determined that adverse weather conditions and possible pilot error contributed to the crash. This devastating incident turned what should have been a joyous occasion into a heartbreaking tragedy.

https://www.yahoo.com/news/rosemere-nascimento-silva-bride-planned-183126466.html