The mischievous Krishna was dearly loved by the cow-herd women, the Gopis, and the cows (symbols of maternal love) whose milk and butter he stole. The girls of the village loved the adolescent Krishna, who stole their clothes when they bathed in the river. As a young man, he danced with them in the moonlight, but when each of thm believed that Krishna loved her alone, he slipped away from her. . . . Later, the group of Gopis was replaced by one Gopi, Radha, mistress of Krishna.
{I don't know where I got the above information!!}
To please His friends, Krsna and Balarama went to the Talavana forest where Balarama began to shake the trees with strong arms. All the ripe fruits fell down to the ground. Dhenukasura, that donkey demon living there, heard the sound of the fruits falling and came running quickly, making the whole ground shake. The demon kicked Balarama in the chest with his back legs. At first Balarama did not say anything and the angry demon kicked Him again even harder. But this time Balarama quickly caught the donkey's legs with one hand. He wheeled him around and around and threw him high into a tree-top where he lay dead. The demon's body was so heavy, the tree fell down upon other trees, and many fell down upon each other. It looked as if a great windy hurricane had blown down all the trees in the forest one after another.
The Stories of Krsna, p. 53. Picture from same book
Lord Krsna suddenly came out of hiding a stood with the gopis. Indeed He looked very beautiful. The gopis made a seat for him in the soft sand and put nice cloth over it. Sitting on the seat with the gopis Krsna became even more beautiful. He said, "sometimes I hide from you, but do not think I was away from you. I was very near and watching you. Please don't be disturbed. Just be happy in your own service to Me."
And so Krsna began to dance hand in hand with the gopis of Vrndavana, the happiest and most beautiful girlsin the three worlds. He put his hands on the shoulders of each gopi on both sides of Him. He danced with every one of them, though each one thought only she was dancing with Krsna. Above in the sky there were may airplanes flying with the demigods who came to see that wonderful dance. The Gandharvas and Kinnaras started singing and showering flowers on the dancers.
As the gopis and Krsna danced together, such nice music was heard from the tinkling of their ankle bells and bangles. Krsna looked like a bright jewel in the middle of a golden necklace."
The Stories of Krsna p. 86.
Krishna now decided that he could return to heaven. But his own mortal end seems tragic; the weapons which were to destroy the Yadava race and bring about his own death were created as the result of a curse by some Brahmins who had been mocked by Yadava boys, one of whom, Samba, was Krishna's son by Jambavate. The Brahmins declared that Samba, who had dressed up as a pregnant woman, would give birth to an iron club that would cause the downfall of the Yadavas. In due course the club was 'born', and though it was smashed by order of King Ugrasena and thrown into the sea, splinters from it escaped destruction; one was swallowed by a fish, later found and made into an arrow head; the others grew into some rushes as hard as iron.
Portents now began to appear in Dwarka of impending destruction, and the Yadavas, frightened by the storms and lightning, misshapen births and other horrors appearing all about them, asked Krishna how they might avert catastrophe. On his advice the men set out on a pilgrimage to Prabhasa. But after performing the various rituals the Yadavas fell to drinking by the river and were assailed by a destructive flame of dissension. In the fight which ensued Krishna's intervention only made their fury greater, and by the end they had all been killed either by each other or by Krishna, who became angry with them. The weapons they used were the rushes growing by the river bank--which were the very ones which grew from the splintered club.
Both Krishna and Balarama were now free to leave the earth. Balarama performed austerities by the sea-shore and, dying, was rejoined to the Absolute. Shesha or Ananta, the divine serpent from whose white hair Balarama was born, flowed out from his mouth. The ocean came to meet him, carrying other serpents in its waters.
Krishna too assumed a yogic posture of abstraction. He sat beneath a fig tree with his left heel pointing outwards. A passing hunter, his arrow tipped with the one remaining splinter of the ironclub, mistook Krishna's foot for a deerand shot at it, thus piercing Krishna's one vulnerable spot and mortally wounding him. Finally, before he died, Krishna sent word to Dwarka that the city would shortly be engulfed by the ocean and warned the remaining Yadvas to leave. But first a great funeral was held for Krishna and Balarama. Vasudeva, Devake, and Rohini, who died of grief at the news of Krishna's death, were placed on the funeral pyre with his body and that of Balarama; they were joined by Krishna's eight principal wives, Balarama's wives, and King Ugrasena, who threw themselves on the flames.
THE KALI AGE
When Krishna died, the present Kali Age is said to have begun, the last and worst of the four ages of the world.
Mythology, An Illustrated Encyclopedia p. 24, 25.