"He always turned up early for training, he was very dedicated and to this day he was in the gym every day"
Mr Giwa (25) died after being stabbed in the neck at Mac Uilliam Road in Tallaght, close to his home, at 7.15pm yesterday.
He was rushed to Tallaght University Hospital after detectives attempted to give him CPR at the scene but he later passed away from his injuries.
A massive investigation into the crime is ongoing by Tallaght gardai today and senior sources say that officers are following a definite line of enquiry.
A man in his 50s who was injured in the same incident is still receiving hospital treatment for his injuries.
Gardai said a man in his 20s has since been arrested on suspicion of murder in Dundalk, Co. Louth.
He is currently detained at Tallaght Garda Station under Section 4 of the Criminal Justice Act 1984.
A post-mortem on Mr Giwa's body is due to conclude later this afternoon.
Antony Dempsey, who is originally from Tallaght, managed Mr Giwa several years ago when he played for Marks Celtic as a teenager.
sundayworld.com he was shocked to learn of the horrific killing involving somebody he knew quite well.
“It’s very sad news,” Antony said. “We heard about it last night and then this morning. He had stopped playing football (a few years ago) but we were still in contact on Instagram.
“He was an absolute gentleman, to be honest, and I never heard a bad word (said about him).
“He always turned up early for training, he was very dedicated and to this day he was in the gym every day.
“He was still really into his fitness and that's why I’m really shocked when I heard about the stabbing.
“I was a manager for Marks Celtic and that’s going back maybe six or seven years when Ademola would have been from 13 to 16 years-of-age.
“He was with us for three seasons,” Antony added. “He was a very good player, we won the league, we won a double and he was very successful. He had huge talent.
Antony said Ademola was in the gym yesterday, working out.
“I talked with him a couple of times and I know he was going to the gym. In every post he puts up he’s working out. Even up to yesterday he was working out, he was walking the dog, so this has come as an absolute shock.
"I know a lot of people from the Tallaght area and he wasn’t mixed up with any gangs or anything,” he added. “ He was just a really nice guy.”