Matsyapurana 45.11

45.11

atha dīrgheṇa kālena mṛgayāṃ nirgataḥ punaḥ
yadṛcchayā ca govindo bilasyābhyāśamāgamat //

Sometime after Śrīkṛiṣṇa, also went out to hunt in the forest and approached the very cave of the bear, when the beast seeing him began to groan and growl, at which he entered the cave with sword in hand. He found the bear to be Jâmbavanta, the King of all bears. He then hastily, with great valour, made Jâmbavanta a captive and then turned his eyes full of wrath towards him. The King of the bears then pleased Lord Śrīkṛiṣṇa, the manifestation of Viṣṇu, with his devotion.—12-15.

Knowing him to be dead, Śrīkṛiṣṇa was dismayed. Some one gave currency to the rumour that Prasena was murdered by Kṛiṣṇa for the sake of the Syamantaka gem. It was insinuated that Prasena went out wearing his priceless Syamantaka gem and was decidedly killed by Kṛiṣṇa, who usurped the jewel from him. Satrâjita, the brother of the deceased, also thought the same.—9-11.