MIAMI (CBS4) – Sean Kingston remains in critical but stable condition at a Miami hospital after crashing his personal watercraft into a Miami Beach bridge and the hip hop singer may owe his life to a Good Samaritan who came to his rescue.

Kingston’s publicist Joseph Carozza provided the update on the singer’s condition Tuesday. He says the singer’s family is asking for privacy while acknowledging how grateful they are for the prayers and support from Kingston’s fans.

The Florida Fish and Wildlife Conservation Commission spokesman Jorge Pino says the 21-year-old singer and a female passenger were injured Sunday afternoon when their watercraft hit the Palm Island Bridge.

A Good Samaritan who just happened to be at the right place at the right time rescued the singer and his passenger from the water.

John Rivera was on a boat near the bridge and saw Kingston under water after the accident.

“I went behind Kingston, put my arms around his back, I just held his body out of the water,” said Rivera.

Rivera said Kingston was throwing up salt water and blood as he kept the two of them afloat until help arrived.

Kingston was rushed to Jackson Memorial Hospital where he remains in the intensive care unit.

Reggae singer Gramps Morgan visited Kingston on Monday and said he’s holding on.

“He’s stable. A lot of rumors are going around saying that he passed away. But he’s not passed away. Sean Kingston is alive and well,” said Morgan.

Tennis player Serena Williams also visited with Kingston most of Monday afternoon.

“Just continue to pray for my, my little buddy,” said Williams.

Kingston rose to fame with his 2007 hit “Beautiful Girls” and was also featured on songs by artists including Justin Bieber.

On Twitter, Bieber posted a message of support for Kingston.

“Got my friend Sean Kingston in my prayers tonight,” Bieber tweeted early Monday. “A true friend and big bro. Please keep him in your prayers tonight as well.”