I've written a trigger where a notification in form of an email is sent to the  Owner when the Lead Status field is changed .But the requirement was different and i did it to send email to the Owner which is not.

 A help in Trigger where the requirement is that, an email should be sent from the Owner to the particular Lead Please help me to achieve this..Below is the code.

Really appreciate the help.

trigger UpdateLeadStatus on Lead (after update) {
    Map <Id, String> leadsOwner = new Map <Id, String> ();

    // Go through every lead in the trigger
    for (Lead lead : trigger.new)
    {
        // Check if the status has been changed
        if (lead.Status != trigger.oldMap.get(lead.Id).Status)
        {
            // get the owner ID's that have been affected
            leadsOwner.put(lead.ownerId, null);
        }
    }

    // Map the owner ID to it's email address
    for (User owner : [SELECT Id, Email FROM User WHERE Id = :leadsOwner.keySet()])
    {
        leadsOwner.put(owner.Id, owner.Email);
    }

    List <Messaging.SingleEMailMessage> emails = new List <Messaging.SingleEMailMessage> ();

    // Go again through every lead in the trigger
    for (Lead lead : trigger.new)
    {   
        // Only work with leads that have owners mapped to their email addresses (only those ones have their status changed)
        if (leadsOwner.get(lead.OwnerId) != null)
        {
            // Create an email message and add it to the list
            Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage(); 
            List <String> toAddresses = new List <String> {leadsOwner.get(lead.OwnerId)};
            mail.setToAddresses(toAddresses); 
            mail.setSubject('Automated Email : Lead Status Updated'); 
            String body = 'The status has been changed on the lead record with ID ' + lead.Id; 
            mail.setPlainTextBody(body); 
            emails.add(mail);
        }
    }
    Messaging.sendEmail(emails);
}