BBC commentator John Hunt's wife and two daughters are believed to be the victims of a triple crossbow murder in Hertfordshire.
Police and paramedics were called to the Hunt family home in Bushey on Tuesday evening following reports that three women had been found with serious injuries.
It's been reported that John, 58, a BBC 5 Live racing commentator, may have raised the alarm after returning home from work.
Despite the best efforts of the medics, 61-year-old mum Carol and her two daughters, aged 28 and 25, died at the scene.
John, a former police officer, has worked for BBC Radio 5 Live for the last 20 years.
Suspect Kyle Clifford, 26, was found in the Enfield area of north London on Wednesday afternoon and is receiving treatment for injuries, Hertfordshire Police said. No shots were fired by police.
In a statement, Detective Inspector Justine Jenkins from the Bedfordshire, Cambridgeshire and Hertfordshire Major Crime Unit said: "This continues to be an incredibly difficult time for the victims' family and we would ask that their privacy is respected as they come to terms with what has happened.
"This investigation is moving at pace and formal identification of the victims is yet to take place. The premature naming of potential victims has caused great upset to the family when they should’ve been given the space to come to terms with their sudden loss.
"Following extensive enquiries, the suspect has been located and nobody else is being sought in connection with the investigation at this time."
Tributes poured in on social media, with one person writing: "The breaking story about John Hunt's family is pretty much the most shocking thing I can ever recall seeing on here. Absolutely appalling - thoughts very much with him and his family."
A second person penned: "Unbelievable news about John Hunt's family today. Struggling to read the saddest news online. Words cannot express my deepest sympathies with you John."