From the Associated Press:
Rotterdam Police spokeswoman Patricia Wessels says police were called to a home in the Dutch port city early Monday morning and found Halman bleeding from a stab wound.
The officers attempted unsuccessfully to resuscitate the 24-year-old.
Wessels says the officers arrested Halman's 22-year-old brother. She declined to give his name, in line with Dutch privacy rules.
She said the brother was being questioned by police. No charges have been filed.
"He is under arrest and right now he is being questioned," Wessels told The Associated Press in a telephone interview. "It will take some time to figure out what exactly happened."