What you need to know:
- Ibrahim Rotich was detained in the coastal city of Mombasa on Thursday over the death of the 25-year-old at their home in Iten in western Kenya.
The husband of Kenyan distance running star Agnes Tirop, who was stabbed to death in a killing that has shocked her home country and the world of athletics, was being held in custody on Friday after a dramatic late-night arrest.
Ibrahim Rotich was detained in the coastal city of Mombasa on Thursday and police said he was the "prime suspect" in the murder of the 25-year-old double world championship medallist at their home in Iten in western Kenya.
Rotich, said by police to be aged about 41, had been expected to appear in court on Friday, but by late afternoon he was still at a Mombasa police station as officials apparently work out where the case against him should be held.
"He had fled from Iten where he is suspected to have committed the offence... At the time of the arrest, he was with one of his friends who is also in custody," local police commander David Mathiu told a press conference.
"An investigation is going on... and the suspect will be arraigned in court soon."
A senior police official in Mombasa told AFP that prosecutors were likely to ask for more time "to firm up a case" and determine where he could be arraigned.
"Given how tense the ground is in Iten, it is unlikely we will have him charged there," the official said.
Police cornered Rotich in Mombasa, using his mobile number to track him down after he used his old SIM card in his new phone after spending days offline, one of the investigating officers told AFP.
Tributes have poured in for Tirop since her body was found with stab wounds in the bedroom of their home in Iten, a high-altitude training hub in western Kenya for many top-class athletes.
Athletics Kenya said it was postponing events for two weeks in honour of Tirop and another runner who was found dead at the weekend of an apparent suicide.
Athletics Kenya president Jackson Tuwei said Tirop's death was a "huge blow" to athletics, describing her as "one of the fastest rising stars" and voicing hope for speedy justice.
Tirop was killed just a month after she smashed the women-only 10 kilometres world record in Germany.
She finished fourth in the 5,000 metres at the Tokyo Olympics this year and had won bronze medals over 10,000m at the 2017 and 2019 world championships. In 2015 she became the second-youngest gold medallist in the women's cross country championships.
Born to a peasant farming family in the sleepy town of Kesses in the Rift Valley, Tirop started her athletics career less than a decade ago but swiftly earned a reputation as one of Kenya's brightest stars.
Her family told reporters she was their breadwinner, paying for children's school fees and clothes.
President Uhuru Kenyatta paid tribute to Tirop, who would have turned 26 later this month, saying she had "brought our country so much glory through her exploits on the global athletics stage".
Her killing came days after another long-distance athlete Hosea Mwok Macharinyang, a member of Kenya's record-breaking world cross country team, died of what athletics officials said was suicide.
Macharinyang, 35, had competed for Kenya in both cross country and 5,000 metre and 10,000 metre races. He won three consecutive titles in the World Cross Country Championships from 2006 to 2008.