Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 37

Sanskrit:

प्रगृह्य केशेषु चलत्किरीटंनिपात्य रङ्गोपरि तुङ्गमञ्चात् । तस्योपरिष्टात् स्वयमब्जनाभ:पपात विश्वाश्रय आत्मतन्त्र: ॥ ३७ ॥

ITRANS:

pragṛhya keśeṣu calat-kirītaṁnipātya raṅgopari tuṅga-mañcāttasyopariṣṭāt svayam abja-nābhaḥpapāta viśvāśraya ātma-tantraḥ

Translation:

Grabbing Kaṁsa by the hair and knocking off his crown, the lotus-naveled Lord threw him off the elevated dais onto the wrestling mat. Then the independent Lord, the support of the entire universe, threw Himself upon the King.

Purport:

In Kṛṣṇa, the Supreme Personality of Godhead, Śrīla Prabhupāda describes the death of Kaṁsa as follows: “Kṛṣṇa at once straddled his chest and began to strike him over and over again. Simply from the strokes of His fist, Kaṁsa lost his vital force.”