Relatives of a murdered doctor who trained at the University of Sheffield have paid tribute to him as they struggle to come to terms with his death.
Richard Field, who graduated from the University of Sheffield's Medical School in 1999, was killed alongside his anaesthetist fiancee in their luxury penthouse in Boston, Massachusetts, on Friday night.
Their throats were slit by their attacker.
An intruder found by police in their home had a backpack containing a replica gun, a knife and jewellery.
During his final moments, Dr Field sent a text to a friend to report a 'serious situation' with a gunman in his home.
Dr Field's family described the murders as a 'tragedy beyond measure'.
Anaesthetist Richard Field, 49, and Lina Bolanos, 38, were 'loving, vital people' with an 'infectious' joy for life, said Dr Field's family
In a statement, Dr Field's family said: "Richard and Lina were loving, vital people whose joy for life was infectious and love for family absolute.
"They thrived on travelling, experiencing cultures and making friends in every port. As such, their loss will be felt by family and loved ones across the world.
"Their passing is a tragedy beyond measure and our lives will forever be changed."
Bampumim Teixeira, 30, has been charged with two counts of murder.
He was shot three times when police arrived at the scene.
The case returns to court on June 8.