Ryan Dorsey's ex-wife and Josey's mother, Naya Rivera, died in July 2020 at age 33

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Ryan Dorsey and son Josey
Credit: Ryan Dorsey/instagram

The late Naya Rivera's son Josey Hollis just hit an academic milestone.

The 5½-year-old's father, Ryan Dorsey, revealed Thursday that his son has started kindergarten, posting an adorable photo of the boy on what appears to be his first day of school.

The picture, which was shared to Dorsey's Instagram, showed Josey dressed in a protective face mask, a red Adidas jacket, and a dark T-shirt as he stood on a green lawn.

To mark the special occasion, Dorsey, 38, also posted throwback photos and video from a father-son visit to the Santa Monica Pier, during which the pair rode on the landmark's iconic roller coaster.

"#TBT (lol) The 1st Day of Kindergarten was a roller coaster to remember 🎢!!❤️," the Justified actor wrote in the caption.

Ryan Dorsey and son Josey
Credit: Ryan Dorsey/instagram

The cute post comes two months after Dorsey proudly celebrated his son's Pre-K graduation. In June, the father of one raved about Josey after attending the boy's commencement ceremony.

"Fresh outta Pre-K boy! Next Up Kindergarten! #summertime #proudDad," he captioned a picture of himself and Josey, who was dressed up in a cap and gown.

At the time, Dorsey added more snaps from Josey's graduation to his Instagram Story, captioning one clip "Kindergarten here we come," and another, "My lil 2021 Pre-K grad." 

RELATED VIDEO: Ryan Dorsey Says Naya Rivera's Sister Nickayla Put 'Life on Hold' to Be There for His Son

Dorsey shared Josey with Glee star Rivera, who died in July 2020 at age 33 as a result of a drowning accident after she and Josey rented a boat at Lake Piru in Southern California. When she didn't return the boat on time, staff found it on the north side of the lake with Josey sleeping in his life jacket on board, but no sign of Rivera.

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The actress was missing for five days before she was found on July 13, and an autopsy later determined Rivera's cause of death to be an accidental drowning. Authorities later said that Rivera likely saved Josey by putting him back on board before she died.

Last month, Dorsey marked one year since Rivera's funeral by sharing an emotional tribute that also included an update on their son.

Ryan Dorsey
Naya Rivera, Ryan Dorsey and son Josey
| Credit: Ryan Dorsey/instagram

"Today…A year ago we laid you to rest. I still can't believe it," he began. "The year has flown by, so fast that it doesn't seem like it's been a year at all.

"Our boy has grown so much," Dorsey continued. "He's such an explorer, so inquisitive. He's sweet, so funny, and his laugh always lights up the room. He's an intuitive soul to say the least. To know him is to love him, everyone that meets him is always smiling."

Calling Josey a "resilient strong kid," Dorsey added in a note to Rivera that their son "misses you but knows he'll see you again, and the invisible string is something that's helped us out during this ever-evolving transition of your time with us on earth that was unfairly & for reasons we'll never understand cut short…too soon…"