Speaking near the scene of Thavisha Peiris' murder, Detective Superintendent Lisa Ray described the attack on the pizza delivery worker as "brutal".
"What makes it more tragic is Thavisha was on his last day, he'd just secured a good job in Sheffield as an IT consultant," Detective Ray told reporters.
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The president decided he wanted a military parade in Washington after he attended France’s Bastille Day last year.
The event will take place at the New York Stadium in Rotherham on Friday.
Donald Trump, meanwhile, has waded into the row over a jailed pastor that caused a crisis for the lira.