Yes, Hippomenes was mortal. He was also known as Melanion.
Hippomenes/Melanion was the husband of Atalanta.
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Milanion
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atalanta was turned into a lion with hippomenes
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Meleager and Melanion (Hippomenes) were in love with
Atalanta.
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Hippomenes won the race against Atalanta by using three golden apples given to him by Aphrodite. During the race, he dropped the apples to distract Atalanta, allowing him to pass her and win the race.