Unknown. He isn't mentioned in the movie but presumably he died.
First off i don't think there even was a Strider, he was made up by fans or written in Kathleen Duey's collection of books. Second, whatever he was called, he did die. One of Spirit's lines in the movie was, " Like my father before me" giving the impression, yes he is dead.
Jackie Robinson's father left the family.
Got sucked in the toilet.
He turned gothic, and well he is just that way. Since Eli is weird, he is just like his father.
I think its because they mention them in some of the books based on spirit and his family Spirit's mother is called Esperanza and his father is called Strider. The mother's name is not just mentioned in books. It's in scripts, some reviews and Spirit stallion of the Cimarron fan sites and official sites. Though Strider isn't shown in the film he is shown in photos as a black Mustang which is why Spirit is Dun while his mother is Palomino. Spirit is a mixture of Palomino and black causing him to be Dun.
His father, Strider, is never shown in the actual movie. Although he is seen in photos to be pure black (as his mother is yellow and white mixed with black, creating yellow and black).
His name was Strider, but I don't know where that name came from. I just found it out myself.
Strider II happened in 1990.
His name is Strider. He is pure black.
Strider - arcade game - happened in 1989.
Spirits's fathers' name is Strider!!
Strider's (Aragorn's) father was Arathorn II, fifteenth Chieftain of the Dunedain of Arnor. He died in 2933, when Aragorn was two years old, of an orc arrow in the eye.
Thunder Spirits happened in 1991.
Strider
Super Robot Spirits happened in 1998.
The Space Sheriff Spirits happened in 2006.
Bangai-O Spirits happened in 2008.