Multiline UILabel within a Static UITableViewCell on iOS 9

I am trying to make a UILabel within a static UITableViewCell multiline depending on its content, which changes.

In the viewDidLoad method, I have the code that initialises the text within the label, shortly followed by:

cellLabel.text = "Here is some text, but because of how long it is, it has to span a number of lines."
cellLabel.numberOfLines = 0
cellLabel.sizeToFit()
tableViewCell.textLabel?.sizeToFit()
tableViewCell.textLabel?.numberOfLines = 0
tableViewCell.textLabel?.lineBreakMode = .ByWordWrapping

And then I am attempting to calculate the height that the row must be in order to accomodate the multiline label:

override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        if (indexPath.section == 2 && indexPath.row == 0) {
            return cellLabel.frame.height
        }
        else {
            return 44
        }
}

However, what is returned is a multiline UITableViewCell but the ending of the text is cut off and isn't displayed. I would add a value to the end of return definitionLabel.frame.height, however the content of the label varies.

Could someone please let me know how I simply have a multiline UILabel within a static UITableViewCell using Swift 2.0 and iOS 9.