function killContract() constant returns (bool) {
    require(msg.sender == owner);
    selfdestruct(owner);
    return true;
}

MyContract.at('0x...')
    .then(instance => {
        c = instance;
        return c.getOwner()
    })
    .then(owner => {
        console.log(`Owner: ${owner}`);
        return c.killContract()
    })
    .then(killed => {
        console.log(`If killed return true: ${killed}`);
    })
    .catch(error => {
        console.log(`${error}`);
    })