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It is well-known that coronal stops, the most unmarked consonants in English, are subject to various consonantal lenition such as deletion, glottaling and flapping. Although variations of a coronal stop between consonants have been well-documented, little is known if a coronal stop also participates in lenition when it precedes an onglide that is regarded as a vowel in terms of its physical property but as a consonant in terms of its phonological behaviors. Results showed that coronal stops did undergo deletion even before an onglide, but the rate was lower. This implies the onglides are still on the border between a consonant and a vowel when it comes to consonantal lenition. The underlying voicing contrast played an important role to the pattern of lenition in which voiceless coronal stops underwent glottaling more. The coronal stops in an irregular inflectional morpheme were resistant to deletion. Gender turned out to be one of the most important factors with regard to coronal stop lenition whereas lexical stress and age were not.