The grief-stricken son of a 59-year-old man killed in an unprovoked stabbing aboard a Queens subway train during rush hour demanded justice as he planned his slain father's funeral Thursday.

An Ecuadorian immigrant, Mesias Lojano worked hard in construction to build a life for his wife, their six children and four grandchildren. But all it took was a chance encounter with an emotionally disturbed rider on a J train for him to lose it all, his son said.

 My father was a good man. He was a hardworking, honest man,  the victim's son, 39-year-old William Lojano, told the Daily News Thursday.  I feel very sad. The truth is, I can't think. I can't talk about it. I want justice. 

Lojano, who was on his way to a funeral home to plan his father's service, held a picture of his father and wept as he spoke to The News outside the brick home in Corona where he lived with his father.

He said he watched cellphone video of his father's killer, Jyrell Thomas, jump on his father and repeatedly stab him.

 I watched the video. Somebody attacked my father. He killed him. I want justice,  William said.

Lojano was stabbed three times in the upper body and once in the neck as an unprovoked fight with his attacker aboard the Jamaica-bound train spilled onto the platform at the Woodhaven Blvd. station around 5:20 p.m. Wednesday.

Thomas, 25, was chased down by horrified onlookers and arrested about a block from the station. On Thursday, he was charged with murder and weapon possession and was undergoing a psychiatric evaluation.

 It was no accident,  the victim's son said about Thomas' horrific attack.  He didn't have to do it. 

Surveillance video reviewed by the Daily News shows dozens of commuters racing out of the elevated subway stop following the bloody stabbing.

The killer, dressed in a black hoodie and armed with what appeared to be a large kitchen knife, exited the station with the crowd, descending the stairs right behind a woman holding a small child's hand. The knife was later recovered by cops.

Thomas was tracked down to the roof of a nearby single-story garage a block away from the subway s

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