How is the word "ya'qib" (يعقب) vocalized in the phrase "He who died and left no progeny" (من مات ولم يعقب)?

The word "يعقب" (ya'qub) is a present tense verb derived from the quadriliteral verb "عقّب" (aqqab). The meaning of "مات ولم يعقب" (he died and did not "ya'qub") is that he did not leave behind a son or a son of his son. Thus, "العقب" (al-'aqab) and "العاقبة" (al-'aqibah) refer to those who remain from his offspring.